Bài tập nguyên hàm, tích phân và ứng dụng – Diệp Tuân Toán 12
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Chủ đề: Chương 3: Nguyên hàm - Tích phân và ứng dụng
Môn: Toán 12
Thông tin:
301 trang
6 tháng trước
Tác giả:
Nguyên Hàm-Tích phân -
1
Tel: 0935.660.880
3
NGUYÊN HÀM-TÍCH PHÂN-
A-
1.
fx
K
.
Fx
fx
u
'F x f x
xK
.
a).
sin cosF x x x x C
C
b).
sin d .x x x
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.
a).
2
ln 1F x x x C
C
b).
2
d
.
1
x
x
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2.
Fx
fx
thì
, F x C C
fx
.
df x x F x C
.
3. .
/
df x x f x
.
. d . d , 0K f x x K f x x K K
.
d d df x g x x f x x g x x
.
4.
NGUYÊN HÀM
Nguyên Hàm-Tích phân -
2
Tel: 0935.660.880
Bng nguyên hàm
n
Nguyên hàm m rng
dk x kx C
,
k
là hng s
1
d 1
1
x
x x C
1
1
d.
1
ax b
ax b x C
a
1
d lnx x C
x
11
d lnx ax b C
ax b a
d
xx
e x e C
1
d
ax b ax b
e x e C
a
d
ln
x
x
a
a x C
a
d
.ln
mx n
mx n
a
a x C
ma
cos d sinx x x C
1
cos d sinax b x ax b C
a
sin d cosx x x C
1
sin d cosax b x ax b C
a
2
1
d tan
cos
x x C
x
2
11
d tan
cos
x ax b C
ax b a
2
1
d cot
sin
x x C
x
2
11
d cot
sin
x ax b C
ax b a
. Tìm n
2
1
3y x x
x
là
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2 1 dF x x x
15F
.
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B. B
1.
Áp dng b tìm.
Áp d chng minh
Fx
là
fx
:
'F x f x
xK
.
Nu kin
F a b
thì ta thay
,ab
vào h nguyên hàm v tìm
hng s
.C
2.
Bài tp 1.Tìm h nguyên hàm ca các hàm s sau:
a).
2
31f x x
b).
2 sin2f x x x
c).
( ) 3
x
fx
d).
cos2f x x
e).
5
( ) 3 1f x x
d).
2
21f x x x
f).
2
2
11
3
f x x
x
g).
sin 2016 2017 dxx
h).
2
1
d.
cos 2 3
x
x
Nguyên Hàm-Tích phân -
3
Tel: 0935.660.880
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Bài tp 2.
fx
2
1
'2f x x
x
và
12f
.
Li gii
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Bài tp 3.
2
; 0
1 ; 0
x
ex
Fx
x x x
; 0
2 1 ; 0
x
ex
fx
xx
trên .
Li gii
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Bài tp 4.
m
32
3 2 4 3F x mx m x x
2
3 10 4f x x x
.
Nguyên Hàm-Tích phân -
4
Tel: 0935.660.880
Li gii
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Bài tp 5.
2
.
x
f x x e
. Tìm
, , a b c
2
.
x
F x ax bx c e
fx
.
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3. .
Câu 1. Chính 2018)
3
f x x x
là
A.
42
x x C
. B.
2
31xC
. C.
3
x x C
. D.
42
11
42
x x C
.
Li gii
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Câu 2.(-)
2
1
3y x x
x
là
A.
32
3
ln
32
xx
xC
. B.
32
2
31
32
xx
C
x
. C.
32
3
ln
32
xx
xC
. D.
32
3
ln
32
xx
xC
Li gii
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Câu 3.(THPT Trn Phú 2018) H các nguyên hàm ca hàm s
42
5 6 1f x x x
là
A.
3
20 12x x C
. B.
53
2x x x C
. C.
53
20 12x x x C
. D.
4
2
22
4
x
x x C
Li gii
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Nguyên Hàm-Tích phân -
5
Tel: 0935.660.880
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Câu 4.(THPT Phan Chu Trinh 2018)
e cos 2018
x
f x x
là:
A.
e sin 2018
x
F x x x C
. B.
e sin 2018
x
F x x x C
.
C.
e sin 2018
x
F x x x
. D.
e sin 2018
x
F x x C
.
Li gii
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Câu 5.(THPT c Th 2018) Nguyên hàm ca hàm s
2018
f x x
,
()x
là hàm s nào trong
các hàm s
A.
2018
( ) 2017.F x x C
,
()C
. B.
2019
()
2019
x
F x C
,
()C
.
C.
2019
()F x x C
,
()C
. D.
2017
( ) 2018.F x x C
,
()C
.
Li gii
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Câu 6.(SGD Bc Giang 2018) H nguyên hàm ca hàm s
2cos2f x x
là
A.
2sin2xC
. B.
sin2xC
. C.
2sin2xC
. D.
sin2xC
.
Li gii
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Câu 7.(S GD- Quãng Nam 2018) Tìm
2
1
dx
x
.
A.
2
11
dxC
xx
. B.
2
11
dxC
xx
. C.
2
11
d
2
xC
xx
. D.
2
2
1
d lnx x C
x
.
Li gii
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Câu 8.(THPT TP HCM 2018)
Fx
1
1
fx
x
và
02F
thì
1F
A.
ln 2
. B.
2 ln2
. C.
3
. D.
4
.
Li gii
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Câu 9.(THPT Trn Nhân Tông 2018) Tìm nguyên hàm ca hàm s
sin 2 1yx
.
A.
1
cos 2 1
2
xC
. B.
cos 2 1xC
. C.
1
cos 2 1
2
xC
. D.
1
sin 2 1
2
xC
Li gii
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Câu 10.(SGD ng Tháp 2018) Hàm s nào sau không là mt nguyên hàm ca
3
f x x
trên
0;
?
A.
3
4
1
3
1
4
x
Fx
. B.
3
3
3
3
4
xx
Fx
. C.
4
3
4
3
4
4
F x x
. D.
3
4
2
3
2
4
x
Fx
.
Li gii
Nguyên Hàm-Tích phân -
6
Tel: 0935.660.880
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Câu 11.(THPT Chuyên Lê Quý 2018) Nguyên hàm ca hàm s
31
e
x
y
là
A.
31
1
e
3
x
C
. B.
31
3e
x
C
. C.
31
1
e
3
x
C
. D.
31
3e
x
C
.
Li gii
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Câu 12.(2018)
51
x
fx
.
A.
5
ln5
x
xC
. B.
5
x
xC
. C.
5 ln
x
x x C
. D.
5
x
xC
.
Li gii
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Câu 13.(THPT A 2018) Tìm
d
21
x
x
A.
1
ln 2 1
2
xC
. B.
2
2
21
C
x
. C.
ln 2 1xC
. D.
1
ln 2 1
2
xC
.
Li gii
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Câu 14.(THPT Trn K Phong 2018)
3sin2 2cos e
x
f x x x
A.
6cos2 2sin e
x
x x C
. B.
6cos2 2sin e
x
x x C
.
C.
3
cos2 2sin e
2
x
x x C
. D.
3
cos2 2sin e
2
x
x x C
.
Li gii
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Câu 15.
2018
3f x x x
là
A.
2019
673
x
xC
. B.
2019
3
2
2019
x
xC
. C.
2019
1
673
x
C
x
. D.
2017
1
6054
2
xC
x
.
Li gii
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Câu 16.( 2018)
2
43
fx
x
.
A.
2d 3
2ln 2 C
4 3 2
x
x
x
. B.
2d 1 3
ln 2
4 3 2 2
x
xC
x
.
C.
2d 1 3
ln 2
4 3 2 2
x
xC
x
. D.
2d 1
ln 4 3
4 3 4
x
xC
x
.
Li gii
Nguyên Hàm-Tích phân -
7
Tel: 0935.660.880
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Câu 17.(THPT Chuyên Vinh 2018)
1
12
fx
x
là
A.
d 2ln 1 2f x x x C
. B.
d 2ln 1 2f x x x C
.
C.
1
d ln 1 2
2
f x x x C
. D.
d ln 1 2f x x x C
.
Li gii
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Câu 18.(S GD - Hu Giang 2018) H nguyên hàm ca hàm s
6
2
11
72f x x
xx
là
A.
7
1
ln 2x x x
x
. B.
7
1
ln 2x x x C
x
.
C.
7
1
ln 2x x x C
x
. D.
7
1
ln 2x x x C
x
.
Li gii
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Câu 19.(THPT Chuyên 2018) Cho
F x
2
yx
.
4F
là
A.
2
. B.
4
. C.
8
. D.
16
.
Li gii
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Câu 20.(S GD- S2018) Cho
cos2 sinF x x x C
fx
.
Tính
πf
.
A.
π3f
. B.
π1f
. C.
π1f
. D.
π0f
.
Li gii
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Câu 21.(SGD ng Tháp 2018) Cho hàm s
2
x
f x x e
. Tìm mt nguyên hàm
Fx
ca hàm
s
fx
tha mãn
00F
.
A.
2
1
x
F x x e
. B.
2 x
F x x e
. C.
1
x
F x e
. D.
2
1
x
F x x e
.
Li gii
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Nguyên Hàm-Tích phân -
8
Tel: 0935.660.880
Câu 22. 2019)
Fx
2e
x
f x x
mãn
0 2019F
. Tính
1F
A.
e 2019
. B.
e 2018
. C.
e 2018
. D.
e 2019
.
Li gii
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Câu 23.(Chuyên Vinh 2019) Tìm nguyên hàm
A. . B. . C. . D.
Li gii
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Câu 24.(THPT Ninh Giang 2018) Cho
Fx
3
e
x
fx
01F
.
?
A.
3
12
e
33
x
Fx
. B.
3
1
e
3
x
Fx
. C.
3
1
e1
3
x
Fx
. D.
3
14
e
33
x
Fx
.
Li gii
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Câu 25.(THPT Chuyên Hà Tnh 2019) Bit
Fx
là mt nguyên hàm ca hàm s
sin
x
f x e x
tha mãn
00F
. Tìm
Fx
?
A.
cos 2
x
F x e x
. B.
cos
x
F x e x
.
C.
cos 2
x
F x e x
. D.
cos 2
x
F x e x
.
Li gii
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Câu 27.(THPT Thành 2019) Cho
Fx
1
21
fx
x
01F
2F
A.
1
1 ln3
2
. B.
1
1 ln5
2
. C.
1 ln3
. D.
1
1 ln3
2
.
Li gii
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Fx
x
f x e x
02F
2
1
2
x
x
F x e
2
1
2
x
x
F x e
2
1
2
x
x
F x e
2
1
2
x
x
F x e
Nguyên Hàm-Tích phân -
9
Tel: 0935.660.880
Câu 28.(TH Tui TR 6-2018) Tính nguyên hàm ca hàm s
5
2018e
e 2017
x
x
fx
x
.
A.
4
2018
d 2017e
x
f x x C
x
. B.
4
504,5
d 2017e
x
f x x C
x
.
C.
4
504,5
d 2017e
x
f x x C
x
. D.
4
2018
d 2017e
x
f x x C
x
.
Li gii
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Câu 29.(THPT Kim Liên 2019)
2
1
sin cos
fx
xx
A.
1
d tan
24
f x x x C
. B.
1
d tan
24
f x x x C
.
C.
1
d tan
24
f x x x C
. D.
1
d tan
24
f x x x C
.
Li gii
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Câu 30.(Chuyên Phan Bi Châu 2019) Hàm s không phi là nguyên hàm ca hàm s
1
21
fx
x
?
A.
ln 2 1 1F x x
. B.
1
ln 2 1 2
2
F x x
.
C.
1
ln 4 2 3
2
F x x
. D.
2
1
ln 4 4 1 3
4
F x x x
.
Li gii
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Câu 31. (THTT 6-489 2018)
5
2018e
e 2017
x
x
fx
x
.
A.
4
2018
d 2017e
x
f x x C
x
. B.
4
504,5
d 2017e
x
f x x C
x
.
C.
4
504,5
d 2017e
x
f x x C
x
. D.
4
2018
d 2017e
x
f x x C
x
.
Li gii
Nguyên Hàm-Tích phân -
10
Tel: 0935.660.880
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Câu 32.(Chuyên Lê n Biên)
Fx
2
0
b
f x ax x
x
1 1, 1 4, 1 0F F f
.
A.
2
3 3 7
.
2 4 4
x
Fx
x
B.
2
3 3 7
.
4 2 4
x
Fx
x
C.
2
3 3 7
.
4 2 4
x
Fx
x
D.
2
3 3 1
.
2 2 2
x
Fx
x
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Câu 33.(S Phú Th 2019) Cho
Fx
là mt nguyên hàm ca
1
1
fx
x
trên khong
1;
tha
mãn
e 1 4F
. Tìm
Fx
.
A.
2ln 1 2x
. B.
ln 1 3x
. C.
4ln 1x
. D.
ln 1 3x
.
Li gii
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Câu 34.(C ng chuyên) Cho
Fx
là mt nguyên hàm ca hàm s
1
21
fx
x
. Bit
12F
. Giá tr ca
2F
là
A.
1
2 ln3 2
2
F
. B.
2 ln3 2F
. C.
2 2ln3 2F
. D.
1
2 ln3 2
2
F
.
Li gii
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Câu 35. ng Ngh An) Cho hàm s
3
2 2 2
22
xx
f x x e xe
, ta có
3
2 2 2x x x
f x dx me nxe pe C
. Giá tr ca biu thc
m n p
bng
A.
1
3
. B.
2
. C.
13
6
. D.
7
6
.
Nguyên Hàm-Tích phân -
11
Tel: 0935.660.880
Li gii
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Câu 36.(ng 2019)Bit hàm s
y f x
có
2
32f x x x m
,
21f
th ca hàm s
y f x
ct trc tung t bng
5
. Hàm s
fx
là:
A.
32
2 5 5x x x
. B.
32
2 7 5x x x
. C.
32
35x x x
. D.
32
45x x x
.
Li gii
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Câu 37.(Tp Chí Toán Hc)Gi
Fx
là mt nguyên hàm ca hàm s
2
x
fx
, tha mãn
1
0
ln2
F
. Tính giá tr biu thc
0 1 ... 2018 2019T F F F F
.
A.
2019
21
1009.
ln2
T
. B.
2019.2020
2T
. C.
2019
21
ln2
T
. D.
2020
21
ln2
T
.
Li gii
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Câu 38 Cho
42
21F x x x
4f x x
y f x
A.
2
. B.
1
. C.
0
. D.
3
.
Li gii
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Nguyên Hàm-Tích phân -
12
Tel: 0935.660.880
Câu 39.(S Qung Ninh)Cho
()Fx
là mt nguyên hàm ca hàm s
2
3
4
x
f x e x x
. Hàm s
()Fx
m cc tr?
A. 1. B. 3. C. 2. D.4.
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Câu 40. (THTT ln5)Cho hàm s
fx
o hàm vi mi
x
và
21
f x x
. Giá tr
21ff
bng
A. 4. B.
1
. C. 2. D. 0.
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Câu 41.(N
Fx
( ) sin2f x x
và
1
4
F
. Tính
6
F
.
A.
1
62
F
. B.
5
64
F
. C.
0
6
F
. D.
3
64
F
.
Li gii
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Câu 42.(THPT Kim Liên 2019) Cho hai hàm s
22
e , 3 4 e
xx
F x x ax b f x x x
. Bit
,ab
là các s th
Fx
là mt nguyên hàm ca
fx
trên . Tính
S a b
.
A.
6S
. B.
12S
. C.
6S
. D.
4S
.
Li gii
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Câu 43.(Cng chuyên)Bit
2
e
x
F x ax bx c
là mt nguyên hàm ca hàm s
2
2 5 2 e
x
f x x x
trên . Giá tr biu thc
0fF
bng :
A.
1
e
. B.
3e
. C.
2
20e
. D.
9e
.
Nguyên Hàm-Tích phân -
13
Tel: 0935.660.880
Li gii
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Câu 44.(THPT chuyên Thái Nguyên)Cho
Fx
là mt nguyên hàm ca hàm s
2
3
4
x
f x e x x
.Hàm s
2
F x x
m cc tr?
A. 6. B. 5. C. 3. D. 4.
Li gii
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Câu 45.(Chuyên Vinh) Bit rng
e
x
x
là mt nguyên hàm ca
fx
trên khong
;
.
Gi
Fx
là mt nguyên hàm ca
e
x
fx
tha mãn
01F
, giá tr ca
1F
bng
A.
7
2
. B.
5e
2
. C.
7e
2
. D.
5
2
.
Li gii
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Nguyên Hàm-Tích phân -
14
Tel: 0935.660.880
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Câu 46(THPT chuyên Bc Giang)Cho hàm s
Fx
là mt nguyên hàm ca
22
2019 4 3 2
x
f x x x x
m cc tr ca hàm s
Fx
là
A.3. B. 4. C. 2. D. 5.
Li gii
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Câu 47.(S Qung Ninh)Cho hàm s
22
( ) ( )
x
F x ax bx c e
là mt nguyên hàm ca
hàm s
22
( ) (2018 3 1)
x
f x x x e
trên khong
( ; )
. Tính
24T a b c
.
A.
1011T
. B.
3035T
. C.
1007T
. D.
5053T
.
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Câu 48.2018)
41F x ax b x
(
,ab
12
41
x
fx
x
. Tính
ab
.
A.
0
. B.
1
. C.
2
. D.
3
.
Li gii
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Nguyên Hàm-Tích phân -
15
Tel: 0935.660.880
Câu 49.(THPT ng 2018) Hàm s
3 1 2
1
e 9 24 17
27
x
F x x x C
là nguyên hàm ca
hàm s
A.
2 3 1
2 1 e
x
f x x x
. B.
2 3 1
2 1 e
x
f x x x
.
C.
2 3 1
2 1 e
x
f x x x
. D.
2 3 1
2 1 e
x
f x x x
.
Li gii
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Câu 50.(2018) Cho hàm s
fx
nh trên tha mãn
21f x x
và
15f
5fx
có hai nghim
1
x
,
2
x
. Tính tng
2 1 2 2
log logS x x
.
A.
1S
.
B.
2S
. C.
0S
. D.
4S
.
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Câu 51.Cho
2
22
2
e1
d 9 1 2ln 1 5e
1
x
x
ax b c x
x x x x C
x
.
Tính giá tr biu thc
M a b c
.
A.
6
. B.
20
. C.
16
. D.
10
.
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1.
Du hiu: Mt s hàm không có d
hàm cha
c, hàm cha
thc, tích các hàm
ng giác, Phân thc hu t
Cách tìm: ta s dng các k thu tìm h nguyên hàm:
K thut 1. tìm h các
Nguyên Hàm-Tích phân -
16
Tel: 0935.660.880
2. Bà
Bài tp 6.
a).
2
2
11
2f x x x
xx
. b).
2
1 x
fx
x
.
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3.
Câu 52. (THPT Chuyên Quc Hc Hu) Tìm h nguyên hàm ca hàm s
2
1
3
x
fx
x
.
A.
1
d3
x
f x x C
x
. B.
31
d
ln3
x
f x x C
x
.
C.
1
d3
x
f x x C
x
. D.
31
d
ln3
x
f x x C
x
.
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Câu 53.(PTNK- TP HCM 2018) nguyên
Fx
2
23
4
xx
x
x
fx
.
A.
12 2
ln12 3
x
xx
F x C
. B.
12
x
F x x x C
.
C.
2
23
ln2 ln3 4
xx
x
xx
Fx
. D.
2
2 3 ln4
ln2 ln3 4
xx
x
xx
Fx
.
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Câu 54.(THPT Nguyn Trãi ng 2018) Tính
2
4
2
1
dxx
x
.
A.
208
17
. B.
196
15
. C.
305
16
. D.
275
12
.
Li gii
Nguyên Hàm-Tích phân -
17
Tel: 0935.660.880
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Câu 55.
12f x x x
.
A.
3
2
3
d2
32
x
f x x x x C
. B.
d 2 3f x x x C
.
C.
3
2
2
d2
33
x
f x x x x C
. D.
3
2
2
d2
33
x
f x x x x C
.
Li gii
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Câu 56.(THPT Chuyên H Long 2019) Tìm nguyên
Fx
1 2 3 ?f x x x x
A.
4
32
11
66
42
x
F x x x x C
. B.
4 3 2
6 11 6F x x x x x C
.
C.
4
32
11
26
42
x
F x x x x C
. D.
3 2 2
6 11 6F x x x x x C
.
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K thut 2. S dng công tha
0
m
n
m
n
x x x
tìm h
1.
Bài tp 7. Tìm các nguyên hàm sau:
a).
2
3
d
x x x
x
x
. b).
2
d
x x x
x
x
. c).
3
1
d
xx
x
x
. d).
d
1
xx
x
x
.
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Nguyên Hàm-Tích phân -
18
Tel: 0935.660.880
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2.
Câu 57. BDVH218LTT 2018)Tìm nguyên hàm
A. . B. .
C. D. .
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Câu 58.
1
32
fx
x
là
A.
2 3 2xC
. B.
2
32
3
xC
. C.
2
32
3
xC
. D.
2 3 2 xC
.
Li gii
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Câu 59. Du Dak-Lak 2019)
1f x x
trên
0;
?
A.
3
2
2
3
F x x x
. B.
1
2
F x x
x
.
C.
1
2
Fx
x
. D.
3
2
2
1
3
F x x x
.
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23f x x
2
d 2 3 2 3 C
3
f x x x x
1
d 2 3 2 3 C
3
f x x x x
1
d 2 3 2 3 C
3
f x x x x
1
d 2 3 C
2
f x x x
Nguyên Hàm-Tích phân -
19
Tel: 0935.660.880
Câu 60.(THPT Kim Liên 2019)
2
1
3f x x
x
A.
3
1
d2f x x x C
x
. B.
3
31
d
2
f x x x C
x
.
C.
3
1
d3f x x x C
x
. D.
3
1
d3f x x x C
x
.
Li gii
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Câu 61.
1
fx
xx
là
A.
2
x
C
. B.
2
C
x
. C.
2
C
x
. D.
2
x
C
.
Li gii
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Câu 62.(THPT QuNguyên hàm ca hàm s
32f x x
là
A.
2
3 2 3 2
3
x x C
. B.
1
3 2 3 2
3
x x C
.
C.
2
3 2 3 2
9
x x C
. D.
31
2
32
C
x
.
Li gii
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Câu 63.
2019
3f x x x
là
A.
2018
2
2019 C
3
x
x
. B.
2018
3
2019 C
2
x
x
.
C.
2020
2C
2020
x
xx
. D.
2020
3C
2020
x
xx
.
Li gii
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Câu 64.(THPT Kim Liên 2017)
1
fx
xx
ln 1 5F x a x
.
A.
2a
. B.
3a
. C.
1a
. D.
1
2
a
.
Li gii
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Nguyên Hàm-Tích phân -
20
Tel: 0935.660.880
Câu 65.2018)
Fx
Fx
f x x
và
11F
.
A.
2
3
F x x x
. B.
21
33
F x x x
.
C.
11
2
22
Fx
x
. D.
25
33
F x x x
.
Li gii
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Câu 66.(-2018)
12f x x
là:
A.
3
2 1 1 2
2
xx
. B.
3
1 2 1 2
2
xx
.
C.
3
2 1 1 2
4
xx
. D.
1
1 2 1 2
3
xx
.
Li gii
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Câu 67.(S Bit
Fx
là nguyên hàm ca hàm s
1
1
21
f x m
x
tha mãn
00F
và
37F
ca tham s
m
bng
A.
2
. B.
3
. C.
3
. D.
2
.
Li gii
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K thut 3. S dng công thc cng giác
1
sin cos [sin( ) sin( ) ]
2
1
sin sin [cos( ) cos( ) ]
2
1
cos cos [cos( ) cos( ) ]
2
ax bx a b x a b x
ax bx a b x a b x
ax bx a b x a b x
tìm
h
Nguyên Hàm-Tích phân -
21
Tel: 0935.660.880
2.
Bài tp 8. Tìm các nguyên hàm sau:
a).
sin3 cos5 dx x x
. b).
22
8cos 2 1 sin dx x x
.
Li gii
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Bài tp 9. Tìm các nguyên hàm sau:
a).
cos sin2 2cos3 cos dx x x x x
. b).
sin5 cos7 d .x x x
Li gii.
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3.
Câu 68.Tìm
sin5 .cos dx x x
.
A.
1
cos5 C.
5
x
B.
11
cos4 cos6 .
8 12
x x C
C.
1
cos5 .
5
xC
D.
11
cos4 cos6 .
8 12
x x C
Li gii
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Câu 69.(THPT Kim Liên) H nguyên hàm ca hàm s
22
sin cosf x x x
là
A.
11
sin4
4 16
x x C
. B.
11
sin4
8 32
xx
.
C.
11
sin4
88
x x C
. D.
11
sin4
8 32
x x C
.
Nguyên Hàm-Tích phân -
22
Tel: 0935.660.880
Li gii
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Câu 70.
sin cos dx x x
A.
cos2
4
x
C
. B.
2
sin
2
x
C
. C.
2
sin
2
x
C
. D.
2
cos
2
x
C
.
Li gii
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Câu 71.(THPT Chuyên Quc Hc Hu 2018) Tìm h ca nguyên hàm
tan2f x x
.
A.
2
tan2 d 2 1 tan 2x x x C
. B.
tan2 d ln cos2x x x C
.
C.
2
1
tan2 d 1 tan 2
2
x x x C
. D.
1
tan2 d ln cos2
2
x x x C
.
Li gii
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Câu 72.(THPT Yên Lc 2019)
Fx
là mt nguyên hàm ca hàm s
2sin cos3y x x
và
00F
,
A.
cos4 cos2F x x x
. B.
cos2 cos4 1
4 8 8
xx
Fx
.
C.
cos2 cos4 1
2 4 4
xx
Fx
. D.
cos4 cos2 1
4 2 4
xx
Fx
.
Li gii
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Nguyên Hàm-Tích phân -
23
Tel: 0935.660.880
Câu 73.(KonTum 12) H nguyên hàm ca hàm s
2sin .cos2f x x x
là
A.
1
cos3 cos
3
x x C
. B.
1
cos3 cos
3
x x C
.
C.
1
cos3 cos
3
x x C
. D.
cos3 cosx x C
.
Li gii
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Câu 74.(THPT An)H nguyên hàm ca hàm s
1
sin .cos
1
f x x x
x
là
A.
1
cos2 ln 1
4
F x x x C
. B.
4cos2 ln 1F x x x C
.
C.
1
cos2 ln 1
4
F x x x C
. D.
1
cos2 ln 1
4
F x x x C
.
Li gii
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K thut 4. S dng công thc h bc
2
2
1
sin 1 cos2
2
1
cos 1 cos2
2
xx
xx
tìm h
1.
Bài tp 10. Tìm các nguyên hàm sau:
a).
2
4cos dxx
. b).
2
1 2sin dxx
.
Li gii.
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Nguyên Hàm-Tích phân -
24
Tel: 0935.660.880
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Bài tp 11. Tìm các nguyên hàm sau:
a).
22
1
d
sin cos
x
xx
. b).
42
1
d
4cos 4cos 1
x
xx
.
Li gii.
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Bài tp 12. Tìm các nguyên hàm sau:
a).
2
3 cos2 dxx
. b).
2
5
sin d
sin
xx
x
.
Li gii.
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Bài tp 13. Tìm các nguyên hàm sau:
a).
sin2 tan dx x x
. b).
2
tan d .xx
Li gii.
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Nguyên Hàm-Tích phân -
25
Tel: 0935.660.880
Bài tp 14. Tìm các nguyên hàm sau:
a).
3
sin 2 dxx
. b).
4
sin d .xx
Li gii.
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2.
Câu 75. BDVH218LTT 2018)
2
cos
2
x
fx
A.
d sinf x x x x C
. B.
d sinf x x x x C
.
C.
1
d sin
22
x
f x x x C
. D.
1
d sin
22
x
f x x x C
.
L
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Câu 76. - 2018)
(I)
2
tan 2f x x
.
(II)
2
2
cos
fx
x
.
(III)
2
tan 1f x x
.
tang x x
?
A. B. C. D. (I), (II), (III).
Li gii
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Nguyên Hàm-Tích phân -
26
Tel: 0935.660.880
Câu 77.
2
4 sin
x
f x x
là
A.
41
sin 2
ln4 4
x
xC
. B.
3
sin
4 ln
3
x
x
xC
.
C.
3
sin
4 ln
3
x
x
xC
. D.
41
sin 2
ln4 2 4
x
x
xC
.
Li gii
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Câu 78.(THPT Chuyên Hà Tnh) Cho hàm s
2
4
sin
m
f x x
. Giá tr ca tham s nguyên
hàm
Fx
ca hàm s
fx
thu kin
01F
và
48
F
là:
A.
4
3
m
. B.
3
4
m
. C.
3
4
m
. D.
4
3
m
.
Li gii
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Câu 79.(THPT Chuyên Hà Tnh) Bit . Giá tr ca là
A. . B. . C. . D. .
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1
d .tan
1 cos
x
x a C
xb
S a b
1
1
2
2
Nguyên Hàm-Tích phân -
27
Tel: 0935.660.880
K thut 5. S dng k thut tách hng t, nhóm hng t, thêm bt hng t tìm h nguyên hàm
d
Px
x
Qx
Px
và
Qx
1.
Px
Qx
Px
chia cho
Qx
Px
Qx
ln. Ta xét hai bài
n sau:
Bài toán 1.
, 0Q x ax b a
. Suy ra
Px
11
d . d . ln
A
x A x A ax b
ax b ax b a
2.
Bài tp 15.
a).
24
3
1 5 3
2
x x x
fx
x
. b).
32
3
3 2 5 3x x x
fx
x
.
Li gii
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Bài tp 16. Tìm các nguyên hàm sau:
a).
2
3 7 1
d
32
xx
x
x
. b).
3
1
d
1
x
x
x
.
Li gii
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PP
Nguyên Hàm-Tích phân -
28
Tel: 0935.660.880
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Bài toán 2.
2
,0Q x ax bx c a
. Suy ra
Px
hàm
1.
Trng hp
2
0ax bx c
12
, xx
thì phân tích
12
Px
AB
Q x x x x x
A
và
B
.
Trng hp
2
0ax bx c
kép
0
x
thì
2
0
P x P x
Qx
a x x
0
2
b
x
a
.
▪ Nu
Px
22
0
00
11
d d .
A A A
xx
a a x x
a x x x x
.
▪ Nu
Px
00
22
00
1
dd
A x x B Ax
Ax B
xx
a
a x x x x
0
2
0
0
1 1 1
. d . dA x B Ax x
a x x
xx
.
2.
Bài tp 17. Tìm các nguyên hàm sau:
a).
2
1
d
56
x
xx
. b).
2
d
56
x
x
xx
.
Li gii
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Nguyên Hàm-Tích phân -
29
Tel: 0935.660.880
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Bài tp 18. Tính các tích phân sau:
a).
2
51
d
2
x
Ix
xx
. b).
3
2
d
1
x
Ix
x
.
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Bài tp 19.
a).
4
16 9
23
x
fx
x
. b).
2
1
45
fx
xx
.
Li gii.
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Nguyên Hàm-Tích phân -
30
Tel: 0935.660.880
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Bài tp 20. Tìm các nguyên hàm sau:
a).
44
3
2
d
xx
x
x
. b).
1
d
11
x
xx
.
Li gii.
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Bài tp 21. Tìm nguyên hàm sau:
a).
3
8
2
x
x
e
fx
e
. b).
2
34
xx
fx
.
Li gii.
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Nguyên Hàm-Tích phân -
31
Tel: 0935.660.880
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Bài tp 22.
a).
1
3cos 2
x
f x x
. b).
52
2
2 .3 .5
x x x x
x
e
fx
e
.
Li gii.
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Bài tp 23. Tìm các nguyên hàm sau:
a).
2
10 d
x
x
. b).
21
d
x
x
x
e
.
Li gii.
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2. .
Câu 80.(THPT 2018) Cho
Fx
21
23
x
fx
x
(2) 3F
. Tìm
Fx
:
A.
( ) 4ln 2 3 1F x x x
. B.
( ) 2ln(2 3) 1F x x x
.
C.
( ) 2ln 2 3 1F x x x
. D.
( ) 2ln |2 3| 1F x x x
.
Li gii
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Nguyên Hàm-Tích phân -
32
Tel: 0935.660.880
Câu 81. Mt nguyên hàm ca hàm s
1
x
fx
x
.
A.
d ln 1 1f x x x x
. B.
d ln 1 1f x x x x
.
C.
d ln 1f x x x x
. D.
ln 1xx
.
Li gii
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Câu 82. Cho
Fx
2
2 2 1
1
xx
fx
x
mãn
01F
.Tính
1F
A.
1 ln2F
. B.
1 2 ln2F
. C.
1 ln2F
. D.
1 2 ln2F
.
Li gii
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Câu 83.-2018) Cho
Fx
2
1
1
xx
fx
x
và
0 2018F
. Tính
2F
.
A.
2F
B.
22F
.
C.
2 2018F
. D.
2 2020F
.
Li gii
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Câu 84.(Chuyên Lê Thánh Tôn 2019) Tìm nguyên hàm ca hàm s
Fx
ca hàm s
32
2
3 3 1
21
x x x
fx
xx
.
A.
2
2
1
1
F x C
x
. B.
2
2
21
x
F x x C
x
.
C.
2
2
21
x
F x x C
x
. D.
2
2
1
1
F x C
x
.
Li gii
Nguyên Hàm-Tích phân -
33
Tel: 0935.660.880
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Câu 85.(THPT Thun Thành Bc Ninh) Gi
Fx
là mt nguyên hàm ca hàm s
2
6
x
x
e
fx
e
,
bit
07F
. Tính tng các nghim c
5Fx
.
A.
ln5
. B.
ln6
. C.
5
. D.
0
.
Li gii
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Câu 86.(THPT Ninh Bình 2019)Tìm nguyên hàm
Fx
2
1x
fx
x
.
A.
1
ln | |F x x C
x
. B.
1
ln | |F x x C
x
.
C.
1
ln | |F x x C
x
. D.
1
ln | |F x x C
x
.
Li gii
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Câu 87.(Tp Chí Toán Hc)Cho bit
2 13
d ln 1 ln 2
12
x
x a x b x C
xx
.
M
A.
28ab
. B.
8ab
. C.
28ab
. D.
8ab
.
Li gii
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Câu 88.(Tp Chí Toán hc)Cho bit
2
4 11
dx ln 2 ln 3
56
x
a x b x C
xx
.
Tính giá tr biu thc:
22
P a ab b
.
A. 12. B. 13. C. 14. D. 15.
Li gii
Nguyên Hàm-Tích phân -
34
Tel: 0935.660.880
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Câu 89.(Tp Chí Toán Hc) Cho bit
3
1
d ln 1 1 lnx a x x b x C
xx
.
Tính giá tr biu thc:
2P a b
.
A. 0. B. -1. C.
1
2
. D. 1.
Li gii
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Câu 90.(S Thanh Hóa 2019) Cho
2
1
d ln 1 ln 1
1
x a x b x C
x
a
,
b
ab
A.
1
. B.
0
. C.
2
. D.
1
.
Li gii
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Câu 91.(S Qung Ninh)Cho hàm s
fx
nh trên
\1R
tha mãn
1
'
1
fx
x
,
0 2017f
,
2 2018f
. Tính
31S f f
.
A.
ln4035S
. B.
4S
. C.
ln2S
. D.
1S
.
Nguyên Hàm-Tích phân -
35
Tel: 0935.660.880
Li gii
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Câu 92.
Fx
2
1
3
21
f x x
x
00F
,
1 ln3
b
Fa
c
a
,
b
,
c
b
c
abc
A.
4
. B.
9
. C.
3
. D.
12
.
Li gii
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Câu 93.(THPT T K H 2018) Nguyên hàm
Fx
ca hàm s
1
21
fx
x
tha mãn
e 1 3
22
F
là:
A.
1
2ln 2 1
2
F x x
. B.
2ln 2 1 1F x x
.
C.
1
ln 2 1 1
2
F x x
. D.
1
ln 2 1
2
F x x
.
Li gii
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Nguyên Hàm-Tích phân -
36
Tel: 0935.660.880
Câu 94.(THPT Lc Ngn Bc Giang 2018) Cho hàm s
fx
nh trên
1
\
3
tha mãn
3
31
fx
x
,
01f
và
2
2
3
f
. Giá tr ca thc
13ff
bng
A.
5ln2 3
. B.
5ln2 2
. C.
5ln2 4
. D.
5ln2 2
.
Li gii
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Câu 95.(S GD- 2018) Cho
Fx
là mt nguyên hàm ca hàm s
1
1
fx
x
tha mãn
52F
và
01F
. M
A.
1 2 ln2F
. B.
2 2 2ln2F
. C.
3 1 ln2F
. D.
32F
.
Li gii
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Câu 96.(Chuyên Quc Hc Hu) Cho hàm s
Fx
là mt nguyên hàm ca hàm s
2
2cos 1
sin
x
fx
x
trên khong
0;
. Bit rng giá tr ln nht ca
Fx
trên khong
0;
là
3
. Chn m sau.
A.
3 3 4
6
F
. B.
23
32
F
. C.
3
3
F
. D.
5
33
6
F
.
Li gii
Nguyên Hàm-Tích phân -
37
Tel: 0935.660.880
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Câu 97.(THPT Yên Khánh 2019)Cho
Fx
là mt nguyên hàm ca hàm s
4 3 2
21
2
x
fx
x x x
trên khong
0;
tha mãn
1
1
2
F
. Giá tr ca biu thc
1 2 3 ... 2019S F F F F
bng
A.
2019
2020
. B.
2019.2021
2020
. C.
1
2018
2020
. D.
2019
2020
.
Li gii
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Câu 98.( Phú 2018)
2
23F x ax bx c x
, , a b c
2
20 30 11
23
xx
fx
x
3
;
2
. Tính
T a b c
.
A.
8T
. B.
5T
. C.
6T
. D.
7T
.
Nguyên Hàm-Tích phân -
38
Tel: 0935.660.880
Li gii
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Câu 99. Phú 2018)
fx
\ 1;1
2
2
1
fx
x
,
2 2 0ff
và
11
2
22
ff
. Tính
3 0 4f f f
A.
6
ln 1
5
. B.
6
ln 1
5
. C.
4
ln 1
5
. D.
4
ln 1
5
.
Li gii
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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0 ĐẶT VẤN ĐỀ:
Trong phần đạo hàm ta tính các đạo hàm chứa tích các đa thức, thương các đa thức, đạo hàm
chứa căn thức, đạo hàm của các hàm hợp ta thường sử dụng các quy tắc và bảng đạo hàm hợp.
Tuy nhiên, trong phần nguyên hàm và tích phân ta không thể sử dụng các quy tắc tích, thương và
các hàm hợp. Do đó, để tính các nguyên hàm trên ta phải sử dụng hai phương pháp: đổi biến số
(đặt ẩn phụ),
phương pháp từng phần.
A. LÝ THUYẾT.
I. Phương pháp đổi biến số
1. Phương pháp. Nếu
df x x F x C
thì
. ' df u x u x x F u x C
.
Trong thực hành: Giả sử ta cần tìm họ nguyên hàm
dI f x x
, trong đó ta có thể phân tích
'f x g u x u x
thì ta thực hiện phép đổi biến số
t u x
, suy ra
d ' dt u x x
.
Khi đó ta được nguyên hàm
.dg t t G t C G u x C
2. Chú ý: Sau khi tìm được họ nguyên hàm theo
t
thì ta phải thay
t u x
.
3. Ví dụ minh họa.
Ví dụ 1. Tìm các nguyên hàm sau:
2
3 7 3 dI x x x
Lời giải
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Ví dụ 2. Tìm các nguyên hàm sau:
a).
5
3
2
1d
18
x
I x x
. b).
2
10
d
.
3
xx
I
x
Lời giải
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II. Phương pháp lấy nguyên hàm từng phần
BI 2. CÁC PHƯƠNG PHÁP TÌM NGUYÊN HÀM CƠ BẢN
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
1. Phương pháp. Cho hai hàm số
u
và
v
liên tục trên đoạn
;ab
và có đạo hàm liên tục trên đoạn
;ab
. Khi đó
d d .u v uv v u
*
2. Trong thực hành để tính nguyên hàm
df x x
bằng từng phần ta làm như sau:
Bước 1. Chọn
, uv
sao cho
ddf x x u v
(chú ý
d ' dv v x x
).
Sau đó tính
dvv
và
d '.du u x
.
Bước 2. Thay vào công thức
*
và tính
dvu
.
3. Chú ý. Thứ tự đặt
u
như sau: nhất
logarit
, nhì đa (
đa thức
), tam lượng (
lượng giác
), tứ mũ .
Ta thường gặp các dạng sau
Dạng 1.
sin
d
cos
x
I P x x
x
, trong đó
Px
là đa thức.
Với dạng này, ta đặt
sin
dd
cos
u P x
x
vx
x
.
Dạng 2.
d
ax b
I P x e x
, trong đó
Px
là đa thức.
Với dạng này, ta đặt
dd
ax b
u P x
v e x
.
Dạng 3.
ln dI P x mx n x
, trong đó
Px
là đa thức.
Với dạng này, ta đặt
ln
dd
u mx n
v P x x
.
Dạng 4.
sin
d
cos
x
x
I e x
x
.
Với dạng này, ta đặt
sin
cos
dd
x
x
u
x
v e x
.
4. Ví dụ minh họa.
Ví dụ 3. Tìm các nguyên hàm sau:
a).
1 sin dI x x x
. b).
2
cos dI x x x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Ví dụ 4. Tìm nguyên hàm :
a).
1
1 cos2
x
I dx
x
b).
3
2
cos2 .
x
I x e dx
c).
2
3
2 1 lnI x xdx
Lời giải
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B. PHÂN DẠNG V BI TẬP MINH HỌA
DẠNG 1. Phương pháp đổi biến số.
1. Phương pháp.
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Nếu
df x x F x C
thì
. ' df u x u x x F u x C
.
Khi gặp hàm số chứa căn thức
fx
, hàm hợp
f u x
…thì ta thực hiện phép đổi biến số
Bước 1: đặt
t u x
, suy ra
d ' dt u x x
.
Bước 2. Rút thế biến
x
theo biến
t
, hoặc tách, thêm, bớt.
Bước 3. Tìm nguyên hàm cơ bản và trả lại biến
x
.
d.g t t G t C G u x C
Chú ý:
Đối với nguyên hàm của hàm lượng giác thì lẻ
cos
thì đặt
sin
, lẻ
sin
thì đặt
cos
.
2. Bài tập minh họa.
Bài tập 1. Tìm các nguyên hàm sau:
a).
5
3
2
1d
18
x
I x x
. b).
2
10
d
.
3
xx
I
x
Lời giải
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Bài tập 2. Tìm các nguyên hàm sau:
a).
2
3 7 3 dI x x x
. b).
32
9dI x x x
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 3. Tìm các nguyên hàm sau:
a).
2
1
d
1
Ix
xx
. b).
1dI x x x
.
Lời giải
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Bài tập 4. Tìm các nguyên hàm sau:
a).
4
sin cos dI x x x
. b).
2
cos dI x x x
.
c).
53
1
sin cosI x xdx
d).
1
2
1
cos sin
I dx
xx
d).
2
2
cos
sin 5sin 6
x
I dx
xx
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 5. Tìm các nguyên hàm sau:
a).
4
1
d
cos
Ix
x
. b).
1
d
1 sin
Ix
x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 6. Tìm các nguyên hàm sau:
a).
3
tan
d
cos
x
Ix
x
. b).
2
4cos 5 sin
d
cos 3cos 2
xx
Ix
xx
.
Lời giải
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Bài tập 7. Tìm các nguyên hàm sau:
a).
ln
d
x
Ix
x
. b).
2
2
ln 1
d
1
xx
Ix
x
.
Lời giải
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Bài tập 8. Tìm các nguyên hàm sau:
a).
2ln 3
d
x
Ix
x
. b).
2
ln
d
1 ln 1
x
Ix
xx
.
Lời giải
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Bài tập 9. Tìm các nguyên hàm sau:
a).
2
d
x
I xe x
. b).
d
x
e
Ix
x
.
Lời giải
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Bài tập 10. Tìm các nguyên hàm sau:
a).
sin
cos d
x
I e x x
. b).
d
2
xx
x
I
ee
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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3. Bài tập rèn luyện.
Bài 1. Tìm các nguyên hàm sau:
a).
3
3
2
3
d
1
xx
Ix
x
. b).
2015
2017
1
d
31
x
Ix
x
.
2010
2012
1
31
x
I dx
x
Lời giải
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Bài 2. Tìm các nguyên hàm sau:
a).
2
4dI x x x
. b).
3
2
d
3
x
Ix
x
.
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Bài 3. Tìm các nguyên hàm sau:
a).
52
sin 1 sin cos dI x x x x
. b).
3
2
d
cos tan 2
x
I
xx
.
Lời giải
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Bài 4. Tìm các nguyên hàm sau:
a).
ln
d
ln 1
x
Ix
xx
. b).
2
ln ln
d
ln ln ln 1
x
Ix
x x x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài 5. Tìm các nguyên hàm sau:
a).
ln
d
x
e
Ix
x
. b).
tan
2
d
cos
x
e
Ix
x
.
Lời giải
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Bài 6. Tìm nguyên hàm:
a).
1
3
11
dx
I
xx
b).
22
2
.9I x x dx
c).
3
2
1
dx
I
xx
d).
4
3
22
.
11
xdx
I
xx
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài 7. Tìm nguyên hàm :
a).
3
1
3
2
3
1
xx
I dx
x
b).
2
3
42
1
,0
1
x
I dx x
xx
c).
3
2
2
3
x
J dx
x
d).
2
3
2
4
x
J dx
x
e).
1
3
dx
K
xx
f).
2
4
1
dx
K
xx
h).
3
22
2
xdx
K
xx
k).
6
2
3 9 1
x
J dx
xx
l).
1
1 2 1
x
J dx
x
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài 8. Tìm nguyên hàm:
a).
2
1
tanI xdx
b).
2
4
1
cos
I dx
x
c).
3
1
tanJ xdx
d).
2
5sin 2sin 2
cos2 6cos 5
xx
J dx
xx
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài 9. Tìm nguyên hàm:
a).
5
1
cos
1 sin
x
I dx
x
b).
4
2
2
sin
cos
x
I dx
x
c).
2
3
1
sin
1 cos2
I x dx
x
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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4. Câu hỏi trắc nghiệm.
Câu 1.(THPT Đô Lương)Tìm họ nguyên hàm
3
1
21
F x dx
x
.
A.
3
1
4 2 1
F x C
x
. B.
4
1
8 2 1
F x C
x
.
C.
2
1
4 2 1
F x C
x
. D.
2
1
6 2 1
F x C
x
.
Lời giải
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Câu 2.(Sở GD và ĐT Bắc Ninh)Tìm họ nguyên hàm của hàm số
3
21
.e
x
f x x
.
A.
3
3
1
d .e
3
x
x
f x x C
. B.
3
1
d 3e
x
f x x C
.
C.
3
1
de
x
f x x C
. D.
3
1
1
de
3
x
f x x C
.
Lời giải
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Câu 3.(THTT-2018) Hàm số
Fx
nào dưới đây là nguyên hàm của hàm số
3
1yx
?
A.
4
3
3
1
8
F x x C
. B.
4
3
4
1
3
F x x C
.
C.
3
3
11
4
F x x x C
. D.
3
4
3
1
4
F x x C
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Câu 4.(THPT Ninh Giang-2018) Xét
5
34
4 3 dI x x x
. Bằng cách đặt:
4
43ux
, khẳng định
nào sau đây đúng?
A.
5
1
d
16
I u u
. B.
5
1
d
12
I u u
. C.
5
dI u u
. D.
5
1
d
4
I u u
.
Lời giải
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Câu 5.(THPT Kim Liên 2019) Tìm nguyên hàm của hàm số
2cos
e .sin
x
f x x
.
A.
2cos
d 2e
x
f x x C
. B.
2cos
d 2e
x
f x x C
.
C.
2cos
1
de
2
x
f x x C
. D.
2cos
1
de
2
x
f x x C
.
Lời giải
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Câu 6.(Sở GD Và Đào Tạo Bắc Ninh) Họ nguyên hàm của hàm số
21f x x
là
A.
1
2 1 2 1
3
x x C
. B.
1
21
2
xC
.
C.
2
2 1 2 1
3
x x C
. D.
1
2 1 2 1
3
x x C
.
Lời giải
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Câu 7.(Sở GD và Đào Tạo Đà Nẵng) Họ nguyên hàm của hàm số
ln x
fx
x
là
A.
2
1
ln ln
2
x x C
. B.
2
1
ln
2
xC
. C.
2
ln xC
. D.
ln ln xC
.
Lời giải
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Câu 8.(Sở GD và Đào Tạo Quảng Nam) Cho hàm số
fx
có đạo hàm liên tục trên khoảng
0;
.
Khi đó
d
fx
x
x
bằng:
A.
1
2
f x C
. B.
f x C
. C.
2 f x C
. D.
2 f x C
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 9.(THPT Nghèn) Họ nguyên hàm của hàm số
2
3
()
1
x
fx
x
là
A.
3
1
.
31
C
x
B.
3
2
1.
3
xC
C.
3
2
.
31
C
x
D.
3
1
1.
3
xC
Lời giải
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Câu 10.(THPT Thạch Thành 2019)Họ nguyên hàm của hàm số
2
20 30 7
23
xx
fx
x
trên khoảng
3
;
2
là?
A.
2
4 2 1 2 3x x x C
. B.
2
4 2 1 2 3x x x
.
C.
2
3 2 1 2 3x x x
. D.
2
4 2 1 2 3x x x C
.
Lời giải
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Câu 11.(Chuyên Đại Học Vinh) Cho
6
2 3 2 dx x x
87
3 2 3 2A x B x C
với
,,A B C
.
Tính giá trị của biểu thức
12 7AB
.
A.
23
252
. B.
241
252
. C.
52
9
. D.
7
9
.
Lời giải.
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Câu 12. (Chuyên Hoàng Văn Thụ 2019) Biết
102 101
100
2 1 2 1
2 1 d
xx
x x x C
ab
,
,ab
.
Giá trị của hiệu
ab
bằng
A.
4
. B.
2
. C.
1
. D.
0
.
Lời giải
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Câu 13.(Sở GD và ĐT Thanh Hóa) Tìm các hàm số
fx
biết
2
cos
2 sin
x
fx
x
.
A.
2
sin
2 sin
x
f x C
x
. B.
1
2 cos
f x C
x
.
C.
1
2 sin
f x C
x
. D.
sin
2 sin
x
f x C
x
.
Lời giải
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Câu 14.(Chuyên Nguyễn Huệ Hà Nội) Gọi
Fx
là nguyên hàm của hàm số
2
()
8
x
fx
x
thỏa
mãn
20F
. Khi đó phương trình
F x x
có nghiệm là:
A.
0x
. B.
1x
. C.
1x
. D.
13x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 15.(Chuyên Nguyễn Du-Đăk Lăk) Cho
2017
2019
11
1
d.
11
b
c
xx
xC
a
xx
với
a
,
b
,
c
là các số
nguyên. Giá trị
abc
bằng
A.
4.2018
. B.
2.2018
. C.
3.2018
. D.
5.2018
.
Lời giải
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Câu 16.(THPT Quỳnh Lưu) Cho
Fx
là nguyên hàm của hàm số
1
1
x
fx
e
và
0 ln2Fe
.
Tập nghiệm
S
của phương trình
ln 1 2
x
F x e
là:
A.
3S
. B.
2;3S
. C.
2;3S
. D.
3;3S
.
Lời giải
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Câu 17.(THPT Thanh Miện -2018) Khi tính nguyên hàm
3
d
1
x
x
x
, bằng cách đặt
1ux
ta
được nguyên hàm nào?
A.
2
2 4 du u u
. B.
2
4duu
. C.
2
2 4 duu
. D.
2
3duu
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 18.(THPT Chuyên Hạ Long 2018) Tìm họ nguyên hàm của hàm số
1
2 2 1
fx
x
.
A.
1
d 2 1
2
f x x x C
. B.
d 2 1f x x x C
.
C.
d 2 2 1f x x x C
. D.
1
d
2 1 2 1
f x x C
xx
.
Lời giải
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Câu 19.(Tạp Chí Toán Học 2018)
Hàm số nào dưới đây là một nguyên hàm của hàm số
sin cos
2 .2 cos sin
xx
y x x
?
A.
sin cos
2
xx
yC
. B.
sin cos
2 .2
ln2
xx
y
. C.
sin cos
ln2.2
xx
y
. D.
sin cos
2
ln2
xx
yC
.
Lời giải
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Câu 20.(THPT Hồng Bàng 2018) Biết
Fx
là một nguyên hàm của hàm số
3
sin .cosf x x x
và
0F
. Tính
2
F
.
A.
2
F
. B.
2
F
. C.
1
24
F
. D.
1
24
F
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 21.(Chuyên Hùng Vương 2019) Giả sử
2 3 d
1
1 2 3 1
xx
C
x x x x g x
(
C
là hằng số).
Tính tổng các nghiệm của phương trình
0gx
.
A.
1
. B.
1
. C.
3
. D.
3
.
Lời giải
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Câu 22.(THPT Lương Văn Chánh 2018) Cho
Fx
là một nguyên hàm của hàm số
1
2e 3
x
fx
thỏa mãn
0 10F
. Tìm
Fx
.
A.
1 ln5
ln 2e 3 10
33
x
F x x
. B.
1
10 ln 2e 3
3
x
F x x
.
C.
13
ln e 10 ln5 ln2
32
x
F x x
. D.
1 3 ln5 ln2
ln e 10
3 2 3
x
F x x
.
Lời giải
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Câu 23.(THPT Chuyên Hạ Long-2018) Tìm họ nguyên hàm của hàm số
5
tanf x x
.
A.
42
11
d tan tan ln cos
42
f x x x x x C
. B.
42
11
d tan tan ln cos
42
f x x x x x C
C.
42
11
d tan tan ln cos
42
f x x x x x C
. D.
42
11
d tan tan ln cos
42
f x x x x x C
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 24.(THPT Chuyên Quốc Học-Huế 2019) Biết rằng
Fx
là một nguyên hàm trên của hàm
số
2018
2
2017
1
x
fx
x
thỏa mãn
10F
. Tìm giá trị nhỏ nhất
m
của
Fx
.
A.
1
2
m
. B.
2017
2018
12
2
m
. C.
2017
2018
12
2
m
. D.
1
2
m
.
Lời giải
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Câu 25.(THPT Chuyên Hạ Long-2018) Biết rằng trên khoảng
3
;
2
, hàm số
2
20 30 7
23
xx
fx
x
có một nguyên hàm
2
23F x ax bx c x
(
a
,
b
,
c
là các số
nguyên). Tổng
S a b c
bằng
A.
4
. B.
3
. C.
5
. D.
6
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 26.(Chuyên Phan Bội Châu-2018) Hàm số
7cos 4sin
cos sin
xx
fx
xx
có một nguyên hàm
Fx
thỏa mãn
3
48
F
. Giá trị
2
F
bằng?
A.
3 11ln2
4
. B.
3
4
. C.
3
8
. D.
3 ln2
4
.
Lời giải
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Câu 27.(THPT Lê Qúy Đôn) Cho
2
22
2
e1
d 9 1 2ln 1 5e
1
x
x
ax b c x
x x x x C
x
.
Tính giá trị biểu thức
M a b c
.
A.
6
. B.
20
. C.
16
. D.
10
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 28.(THPT Chuyên Quang Trung) Cho
2
2
( ) 2 1 5
1
x
f x x
x
, biết
Fx
là một nguyên
hàm của hàm số
fx
thỏa
06F
. Tính
3
4
F
.
A.
123
16
. B.
125
16
. C.
126
16
. D.
127
16
.
Lời giải
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Câu 29.(THPT Chuyên KHTN) Nguyên hàm
10
12
2
d
1
x
x
x
bằng.
A.
11
12
33 1
x
C
x
. B.
11
12
11 1
x
C
x
. C.
11
12
31
x
C
x
. D.
11
12
11 1
x
C
x
.
Lời giải
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Câu 30.(THPT Nguyễn Tất Thành) Tìm nguyên hàm
1
x
dx
I
e
.
A.
ln 1
x
I x e C
. B.
ln 1
x
I x e C
. C.
ln 1
x
I x e C
. D.
ln 1
x
I x e C
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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DẠNG 2. Phương pháp từng phần.
1. Phương pháp.
Phương pháp. Cho hai hàm số
u
và
v
liên tục trên đoạn
;ab
và có đạo hàm liên tục trên
đoạn
;ab
. Khi đó
d d .u v uv v u
*
Trong thực hành để tính nguyên hàm
df x x
bằng từng phần ta làm như sau:
Bước 1. Chọn
, uv
sao cho
ddf x x u v
(chú ý
d ' dv v x x
).
Sau đó tính
dvv
và
d '.du u x
.
Bước 2. Thay vào công thức
*
và tính
dvu
.
Chú ý. Thứ tự đặt
u
như sau: nhất
logarit
, nhì đa (
đa thức
), tam lượng (
lượng giác
), tứ mũ
2. Bài tập minh họa.
Loại 1
sin
d
cos
x
I P x x
x
trong đó
Px
là đa thức. Với dạng này, ta đặt
sin
dd
cos
u P x
x
vx
x
.
Bài tập 11. Tìm các nguyên hàm sau:
a).
1 sin dI x x x
. b).
2
cos dI x x x
.
Lời giải
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Bài tập 12. Tìm các nguyên hàm sau:
a).
1
2 1 cosI x xdx
. b).
1
sin 2I x xdx
.
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Loại 2.
d
ax b
I P x e x
, trong đó
Px
là đa thức. Với dạng này, ta đặt
dd
ax b
u P x
v e x
.
Bài tập 13. Tìm các nguyên hàm sau:
a).
d
x
I xe x
. b).
2
1d
x
I x x e x
.
Lời giải
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Bài tập 14. Tìm các nguyên hàm sau:
a).
2
21
x
I x e dx
b).
3
d
x
I x e x
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Loại 3.
ln dI P x mx n x
, trong đó
Px
là đa thức. Với dạng này, ta đặt
ln
dd
u mx n
v P x x
.
Bài tập 15. Tìm các nguyên hàm sau:
a).
3
ln 2 dI x x x
. b).
2 1 ln 1 dI x x x
.
Lời giải
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Bài tập 16. Tìm các nguyên hàm sau:
a).
2
3
2
ln 1
.
1
x x x
I dx
x
. b).
2
1
ln 1K x x dx
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Loại 4.
sin
d
cos
x
x
I e x
x
. Với dạng này, ta đặt
sin
cos
dd
x
x
u
x
v e x
.
Bài tập 17. Bài 14. Tìm các nguyên hàm sau:
a).
sin d
x
I xe x
. b).
3
cos2 d
x
I xe x
.
c).
3
2
cos2 .
x
I x e dx
d).
2
sin . d .
x
I x e x
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Loại 5. Đổi biển rồi từng phần
Bài tập 18. Tìm các nguyên hàm sau:
a).
2
3
d
x
I x e x
. b).
39
d
x
I e x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 19. Tìm các nguyên hàm sau:
a).
2
3
1 2 d .
xx
I x e x
b).
d.
x
I xe x
Lời giải
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3. Bài tập rèn luyện.
Bài 10. Tìm các nguyên hàm sau:
a).
2 1 cos dI x x x
. b).
2
cos2 dI x x x
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài 11. Tìm các nguyên hàm sau:
a).
2
ln 1 dI x x x
. b).
ln 1 d
xx
I e e x
.
Lời giải
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Bài12. Tìm các nguyên hàm sau:
a).
4
4
3
4
1
x
I dx
x
b).
2
ln d .I x x
c).
8
5
3
4
1
x
I dx
x
Lời giải
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4. Câu hỏi trắc nghiệm.
Câu 31. (Sở GD và Đào Tạo Quãng Bình 2019) Họ nguyên hàm của hàm số
.sin2f x x x
là:
A.
11
cos2 sin 2
24
xx
. B.
1
cos2 sin2
24
x
x x C
C.
11
cos2 sin2
24
x x C
. D.
1
cos2 sin2
24
x
xx
.
Lời giải
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Câu 32. (Thuận Thành Bắc Ninh 2019) Tìm nguyên hàm của hàm số
cosf x x x
.
A.
d sin cosf x x x x x C
. B.
d sin cosf x x x x x C
.
C.
d sin cosf x x x x x C
. D.
d sin cosf x x x x x C
.
Lời giải
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Câu 33.(Sở GD và ĐT Lạng Sơn 2019) Cho hàm số
y f x
.
Biết hàm số đã cho thỏa mãn hệ thức
sin = cos cos
x
f x xdx f x x xdx
. Hỏi hàm số
y f x
là hàm số nào trong các hàm số sau?
A.
ln
x
fx
. B.
ln
x
fx
. C.
ln
x
fx
. D.
ln
x
fx
.
Lời giải
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Câu 34. (Trường Thực Hành Cao Nguyên 2019) Hàm số
1
x
f x x e
có một nguyên hàm
Fx
là kết quả nào sau đây, biết nguyên hàm này bằng
1
khi
0x
?
A.
1
x
F x x e
. B.
11
x
F x x e
. C.
2
x
F x x e
. D.
23
x
F x x e
Lời giải
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Câu 35.(Chuyên Trần Đại Nghĩa) Giá trị của
2
2
ln
x
I xdx
x
bằng
A.
22
2
2ln ln
24
xx
I x x c
. B.
22
2
ln ln
24
xx
I x x c
.
C.
22
2
ln ln
24
xx
I x x c
. D.
2 2 2
ln
ln
2 2 4
x x x
I x c
.
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Câu 36.(THPT Chuyên-Sơn La 2019)Họ nguyên hàm của hàm số
1 sinf x x x
là
A.
2
sin cos
2
x
x x x C
. B.
2
cos sin
2
x
x x x C
.
C.
2
cos sin
2
x
x x x C
. D.
2
sin cos
2
x
x x x C
.
Lời giải
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Câu 37.(THPT Lý Nhân Tông) Một nguyên hàm
( )cos3 1
( 2)sin3 sin3 2017
x a x
x xdx x
bc
thì tổng
S a b c
bằng
A.
S
3
B.
S
15
C.
S
10
D.
S
14
Lời giải
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Câu 38.(THPT Triệu Thái Vĩnh Phúc) Họ nguyên hàm của hàm số
( ) 3 cos3f x x x x
là :
A.
3
cos3
sin3
3
x
x x x C
. B.
3
cos3
sin3
3
x
x x x C
.
C.
3
sin3 cos3x x x x C
. D.
3
cos3
sin3
3
x
x x x C
.
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
74
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Câu 39.(THPT Hải Hậu) Họ nguyên hàm của hàm số
1 2sinf x x x
là:
A.
2
2 2 sinxx x C
. B.
2
2 cos 2sinx x x x C
.
C.
2
1
2 cos 2sin
2
x x x x C
. D.
2
1
2 cos 2sin
2
x x x x C
Lời giải
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Câu 40.(Sở GD và Đào Tạo Quảng Nam) Biết
2
2
1
ln 1 d ln5 ln2x x x a b c
với
a
,
b
,
c
là các số
hữu tỉ. Tính
P a b c
.
A.
3P
. B.
0P
. C.
5P
. D.
2P
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Câu 41.(THPT TX Quãng Trị 2019) Nguyên hàm của hàm số
2
2
ln
x
f x x
x
là
A.
22
2
2ln ln
24
xx
x x C
. B.
22
2
ln ln
24
xx
x x C
.
C.
22
2
ln ln
22
xx
x x C
. D.
2 2 2
ln
ln
2 2 4
x x x
xC
.
Lời giải
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Câu 42.(Chuyên Lê Hồng Phong Nam Định) Họ nguyên hàm của hàm số
4
e
x
f x x x
là
A.
5
1
1e
5
x
x x C
. B.
5
1
1e
5
x
x x C
. C.
5
1
e
5
x
x x C
. D.
3
4 1 e
x
x x C
.
Lời giải
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Câu 43. (THPT Gia Lộc Hải-Dương 2019) Họ nguyên hàm của hàm số
21
x
f x x e
là
A.
23
x
x e C
. B.
23
x
x e C
. C.
21
x
x e C
. D.
21
x
x e C
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 44. (Cụm Trần Kim Hưng 2019) Tìm họ các nguyên hàm
2
1 e d
x
xx
A.
2
22
11
.e e
2 2 4
xx
x
xC
. B.
2
22
1
.e e
22
xx
x
xC
.
C.
2
22
11
.e e
2 2 4
xx
x
xC
. D.
2
22
.e e
2
xx
x
xC
.
Lời giải
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Câu 45. (THPT Chuyên Quang Trung 2019) Cho hàm số
fx
thỏa mãn
2
0 0,
1
x
f f x
x
.
Họ nguyên hàm của hàm số
4.g x x f x
là
A.
2 2 2
1 lnx x x C
. B.
2 2 2
ln 1x x x
.
C.
2 2 2
1 ln 1x x x C
. D.
2 2 2
1 ln 1x x x
.
Lời giải
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Câu 46. (THPT Chuyên Phan Bội Châu) Họ nguyên hàm của hàm số
2
.
x
f x x e
là
A.
2
11
22
x
F x e x C
. B.
2
1
2
2
x
F x e x C
.
C.
2
22
x
F x e x C
. D.
2
1
2
2
x
F x e x C
.
Lời giải.
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
77
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 47. (THPT Chuyên Phan Bội Châu) Họ các nguyên hàm của hàm số
2
( ) lnf x x x
là
A.
22
1
2ln 2ln 1
4
x x x C
. B.
22
1
2ln 2ln 1
4
x x x C
.
C.
22
1
2ln 2ln 1
2
x x x C
. D.
22
1
2ln 2ln 1
2
x x x C
.
Lời giải
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Câu 48. (THPT Chuyên Phan Bội Châu) Họ nguyên hàm của hàm số
3
e1
x
f x x
là:
A.
2
3
1
3 1 e
92
x
x
xC
. B.
2
3
1
3 1 e
92
x
x
xC
.
C.
2
3
1
3 1 e
92
x
x
xC
. D.
2
3
1
3 1 e
92
x
x
xC
.
Lời giải
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Câu 49. (THPT Chuyên Sơn La 2019) Họ nguyên hàm của hàm số
2 sin 1f x x x
là
A.
2
2 cos 2sinx x x x C
. B.
2
cosx x x C
.
C.
2
2 cos 2sinx x x x C
. D.
2
2 cos 2sinx x x x C
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 50. (THPT Nguyễn-Đức Cảnh Thái Bình) Họ nguyên hàm của hàm số
sin
x
f x x e x
là
A.
cos sin
x
x e x x x C 1
. B.
cos sin
x
x e x x x C 1
.
C.
cos sin
x
x e x x x C 1
. D.
cos sin
x
x e x x x C 1
.
Lời giải
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Câu 51. (THPT Hai Bà Trưng 2019)Cho biết
3
11
( ) 2
3
F x x x
x
là một nguyên hàm của
2
2
2
( ) .
xa
fx
x
Tìm nguyên hàm của
( ) cos .g x x ax
A.
sin cosx x x C
. B.
11
sin2 cos2
24
x x x C
.
C.
sin cosx x x C
. D.
11
sin2 cos2
24
x x x C
.
Lời giải
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Câu 52
.
(THPT Hàm Rồng) Biết
cos2 d sin2 cos2x x x ax x b x C
với
a
,
b
là các số hữu tỉ.
Tính
ab
?
A.
1
8
ab
. B.
1
8
ab
. C.
1
4
ab
. D.
1
4
ab
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 53.(THPT Nguyễn Huệ 2019) Cho hàm số
fx
, biết
e1
x
f x x
và
01f
. Khi đó
1f
bằng
A.
e + 1
. B. 2. C.
e + 2
. D. 3.
Lời giải
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Câu 54. (Chuyên Thái Bình 2019) Họ nguyên hàm của hàm số
2 sin2f x x x
là:
A.
2
1
cos2
2
x x C
. B.
2
2cos2x x C
. C.
2
1
cos2
2
x x C
. D.
2
2cos2x x C
.
Lời giải
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Câu 55.(THPT Phúc Trạch Hà Tĩnh 2019) Tính
3
ed
x
F x x x
. Chọn kết quả đúng.
A.
3
3 3 e
x
F x x C
. B.
3
3e
x
F x x C
.
C.
3
3
e
3
x
x
F x C
. D.
3
3
e
3
x
x
F x C
.
Lời giải
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Câu 56. (Sở GD và Đào Tạo Phú Thọ) Họ nguyên hàm của hàm số
3 ( cos )y x x x
là:
A.
3
3( sin cos )x x x x c
.
B.
3
3( sin cos )x x x x c
.
C.
3
3( sin cos )x x x x c
.
D.
3
3( sin cos )x x x x c
.
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
80
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Câu 57. (Chuyên Nguyễn Du-Đăk Lăk) Cho
22
lnx x x
Fx
ab
là một nguyên hàm của hàm số
lnf x x x
, trong đó
,ab
là các hằng số thực. Giá trị
3ab
bằng
A.
3
. B.
1
. C.
2
. D.
5
.
Lời giải
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Câu 58.(Sở GD và Đào Tạo Phú Thọ 2019) Họ nguyên hàm của hàm số
3
2e
x
f x x
là
A.
23
1
e 3 1
9
x
x x C
. B.
22
1
e1
9
x
x x C
.
C.
22
1
2 e 1
3
x
x x C
. D.
23
1
e 3 1
9
x
x x C
.
Lời giải
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Câu 59. (Tạp Chí Toán Học ) Tìm họ nguyên hàm
2
1
x
F x x x e dx
.
A.
2
3
x
F x x e C
B.
2
4
x
F x x x e C
C.
2
34
x
F x x x e C
D.
2
34
x
F x x x e C
Lời giải
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Câu 60. (Chuyên Hùng Vương Bình Phước) Cho
3
1
()
3
Fx
x
là một nguyên hàm của hàm số
()fx
x
. Tìm nguyên hàm của hàm số
'( )lnf x x
.
A.
35
ln 1
'( )ln d
5
x
f x x x C
xx
. B.
33
ln 1
'( )ln d
3
x
f x x x C
xx
.
C.
33
ln 1
'( )ln d
3
x
f x x x C
xx
. D.
35
ln 1
'( )ln d
5
x
f x x x C
xx
.
Lời giải
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Câu 61.(THPT Chuyên Hà Tỉnh) Cho hàm số . Họ nguyên hàm của hàm số trên là
A. . B. .
C. . D. .
Lời giải
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Câu 62. (Sở GD và ĐT Hà Nam) Họ nguyên hàm của hàm số
2 3 lnf x x x
là
A.
2
2
3 ln 3
2
x
x x x x C
. B.
2
2
3 ln 3
2
x
x x x x C
.
C.
2
2
3 ln 3
2
x
x x x x C
. D.
2
2
3 ln 3
2
x
x x x x C
.
Lời giải
e sin
x
yx
11
e cos e sin
22
xx
x x C
11
e cos e sin
22
xx
x x C
11
e cos e sin
22
xx
x x C
11
e cos e sin
22
xx
x x C
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 63.(Sở GD và ĐT Phú Thọ) Họ nguyên hàm của hàm số
3 cosy x x x
là
A.
3
3 sin cosx x x x C
. B.
3
3 sin cosx x x x C
.
C.
3
3 sin cosx x x x C
. D.
3
3 sin cosx x x x C
.
Lời giải
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Câu 64.(Chuyên ĐH Vinh) Tất cả các nguyên hàm của hàm số
2
sin
x
fx
x
trên khoảng
(0; )x
A.
cot ln(sin )x x x C
B.
cot ln(sin )x x x C
C.
cot ln(sin )x x x C
D.
cot ln(sin )x x x C
Lời giải
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Câu 65.(Chuyên ĐH Vinh) Tất cả các nguyên hàm của hàm số
2
()
cos
x
fx
x
trên khoảng
0;
2
là
A. B.
C. D.
Lời giải
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tan ln cos .F x x x x C
tan ln cos .F x x x x C
tan ln cos .F x x x x C
tan ln cos .F x x x x C
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 66.(THPT Ngô Quyền Hà Nội) Cho
2
F x x
là một nguyên hàm của hàm số
2
.
x
f x e
. Khi đó
2
.d
x
f x e x
bằng
A.
2
2x x C
. B.
2
x x C
. C.
2
22x x C
. D.
2
22x x C
.
Lời giải
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Câu 67. (Chuyên ĐH Vinh) Tìm một nguyên hàm của hàm số
2
tanxx
trên
0; .
2
A.
2
2
tan d tan ln cos
2
x
x x x x x x C
. B.
2
2
tan d tan ln cos
2
x
x x x x x x C
.
C.
2
2
tan d tan ln cos
2
x
x x x x x x C
. D.
2
2
tan d tan ln cos
2
x
x x x x x x C
.
Lời giải
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Câu 68.(THPT Nguyễn Khuyến)Giả sử
Fx
là một nguyên hàm của hàm số
2
ln 3
x
fx
x
thỏa
mãn
2 1 0 FF
và
1 2 ln2 ln5 F F a b
, với
a
,
b
là các số hữu tỷ. Giá trị của
36ab
bằng
A.
4
. B.
5
. C.
0
. D.
3
.
Lời giải
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 69.(Trung Tâm Thanh Tường) Họ nguyên hàm của hàm số
2
l12 nxx
y
x
x
là
A.
2
2
1 ln
2
x
x x xx C
. B.
2
2
1 ln
2
x
x x xx C
.
C.
2
2
1 ln
2
x
x x xx C
. D.
2
2
1 ln
2
x
x x xx C
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 70.(THPT Lê Qúy Đôn) Họ nguyên hàm của hàm số
2 2 lnf x x x
là
A.
22
3
ln
2
x x x
. B.
22
3
ln
2
x x x C
. C.
22
5
ln
2
x x x
. D.
22
5
ln
2
x x x C
.
Lời giải
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Câu 70.(THPT Chuyên Quốc Học-Huế 2018) Cho
a
là số thực dương. Biết rằng
Fx
là một nguyên
hàm của hàm số
1
e ln
x
f x ax
x
thỏa mãn
1
0F
a
và
2018
2018 eF
. Mệnh đề nào sau
đây đúng ?
A.
1
;1
2018
a
. B.
1
0;
2018
a
. C.
1;2018a
. D.
2018;a
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Câu 71. (THPT Gia Lộc 2019) Cho hàm số
fx
xác định trên
\2
thoả mãn
31
2
x
fx
x
,
01f
và
42f
. Giá trị của biểu thức
23ff
bằng
A.
12
. B.
ln 2
. C.
10 ln2
. D.
3 20ln2
.
Lời giải
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DẠNG 3. Phương pháp lấy nguyên hàm hai vế (Tích phân hàm ẩn).
1. Phương pháp chung.
Khi gặp nguyên hàm của hàm
fx
và cho dưới dạng hàm
fx
như:
( ) ( ). ( ) 0
n
f x p x f x
hoặc
( ). ( ) ( )
n
f x f x p x
hoặc
( ) ( ) ( ) ( ) ( )u x f x u x f x h x
hoặc
( ) ( ) ( )f x f x h x
hoặc
( ) ( ) ( )f x f x h x
thì ta nghỉ đến kỹ thuật lấy nguyên hàm hai vế.
Loại 1.
( ) ( ). ( ) 0
n
f x p x f x
(thương)
2. Phương pháp.
Bước 1. Chia hai vế của biểu thức cho
n
fx
ta được
( ) ( )
( ) 0 ( )
( ) ( )
nn
f x f x
p x p x
f x f x
Bước 2. Lấy nguyên hàm hai vế ta được
()
d ( )d
()
n
fx
x p x x
fx
.
Bước 3. Đặt
t f x dt f x dx
Bước 4. Tìm nguyên hàm
( )d
n
p x x
dt
t
theo biến
t
rồi trả lại biến
.x
3. Bài tập minh họa.
Câu 72.(Chuyên Hùng Vương Gia Lai) Cho hàm số
y f x
xác định trên , thỏa mãn
0fx
,
x
và
20f x f x
. Tính
1f
biết rằng
11f
.
A.
4
e
. B.
3
e
. C.
4
e
. D.
2
e
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 73.(THQG 2018)Cho hàm số
fx
thỏa mãn
1
2
25
f
và
2
3
4.f x x f x
với mọi
x
. Giá trị của
1f
bằng?
A.
41
100
. B.
1
10
. C.
391
400
. D.
1
40
.
Lời giải
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Câu 74.(Đề Chính Thức 2018) Cho hàm số
fx
thỏa mãn
1
2
5
f
và
2
3
f x x f x
với
mọi
x
. Giá trị của
1f
bằng
A.
4
35
. B.
71
20
. C.
79
20
. D.
4
5
.
Lời giải
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Câu 75.(THPT Lê Xoay 2018) Giả sử hàm số
y f x
liên tục, nhận giá trị dương trên
0;
và
thỏa mãn
11f
,
. 3 1f x f x x
, với mọi
0x
. Mệnh đề nào sau đây đúng?
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A.
2 5 3f
. B.
1 5 2f
. C.
4 5 5f
. D.
3 5 4f
.
Lời giải
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Câu 76.(Đề Chính Thức 2018) Cho hàm số
fx
thỏa mãn
2
2
9
f
và
2
2f x x f x
với
mọi
x
. Giá trị của
1f
bằng
A.
35
36
. B.
2
3
. C.
19
36
. D.
2
15
.
Lời giải
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Câu 77.(THPT Đặng Thúc Hứa) Cho hàm số
fx
có đạo hàm xác định, liên tục trên đoạn
0;1
đồng thời thỏa mãn các điều kiện
01f
và
2
f x f x
. Đặt
10T f f
, hãy chọn
khẳng định đúng?
A.
21T
. B.
10T
. C.
01T
. D.
12T
.
Lời giải
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Câu 78. (THPT Yên Định 2018) Cho hàm số
fx
có đạo hàm liên tục trên và thỏa mãn
0fx
,
x
. Biết
01f
và
'
22
fx
x
fx
. Tìm các giá trị thực của tham số
m
để phương
trình
f x m
có hai nghiệm thực phân biệt.
A.
me
. B.
01m
. C.
0 me
. D.
1 me
.
Lời giải
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Câu 79. Cho hàm số
fx
liên tục trên
,\ 0; 1
thỏa mãn
2
1.x x f x f x x x
với
mọi
0; 1\x
và
1 2ln2.f
Biết
2 ln3f a b
với
, ab
, tính
22
.P a b
A.
1
.
2
P
B.
3
.
4
P
C.
13
.
4
P
D.
9
.
2
P
Lời giải.
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Câu 80.Cho hàm số
fx
liên tục, không âm trên
0;3 ,
thỏa
2
. 2 1f x f x x f x
với mọi
0;3x
và
0 0.f
Giá trị của
3f
bằng
A.
0.
B.
1.
C.
3.
D.
3 11.
Lời giải.
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Câu 81.Cho hàm số
fx
liên tục, không âm trên
0;
2
, thỏa
2
. ' cos 1f x f x x f x
với
mọi
0;
2
x
và
0 3.f
Giá trị của
2
f
bằng
A.
0.
B.
1.
C.
2.
D.
2 2.
Lời giải.
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Câu 82.(THPT Lý Thường Kiệt Hà Nội) Giả sử hàm số có đạo hàm liên tục trên nhận giá
trị dương trên khoảng và thỏa mãn với mọi Mệnh đề
nào sau đây là đúng?
A. B.
C. D.
Lời giải
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fx
,
0;
1 1, ' 3 1f f x f x x
0.x
4 5 5.f
1 5 2.f
3 5 4.f
2 5 3.f
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 83.(THPT Thuận Thành) Cho hàm số
( ) 0fx
;
2
2 1 .f x x f x
và
1 0,5f
.
Biết tổng
1 2 3 ... 2017
a
f f f f
b
;
;ab
với
a
b
tối giản. Chọn khẳng định
đúng.
A.
1
a
b
. B.
1ab
. C.
4035ba
. D.
1ab
.
Lời giải
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Câu 84. Cho hàm số
fx
có đạo hàm liên tục trên
0;
, biết
2
' 2 3 0,f x x f x
0fx
với mọi
0x
và
1
1.
6
f
Tính
1 1 2 ... 2018 .P f f f
A.
1009
.
2020
P
B.
2019
.
2020
P
C.
3029
.
2020
P
D.
4039
.
2020
P
Lời giải.
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 85.(THPT Quỳnh Lưu) Cho hàm số
0fx
thỏa mãn điều kiện
2
23f x x f x
và
1
0
2
f
. Biết rằng tổng
1 2 3 ... 2017 2018
a
f f f f f
b
với
*
,ab
và
a
b
là phân số tối giản. Mệnh đề nào sau đây đúng?
A.
1
a
b
. B.
1
a
b
. C.
1010ab
. D.
3029ba
.
Lời giải
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Câu 86.(THPT Yên Phong) Cho hàm số
fx
liên tục trên tập thỏa mãn
2
1 2 1f x x x f x
và
1fx
,
00f
. Tính
3f
.
A.
3
. B. 9. C. 3. D. 0.
Lời giải
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Câu 87.(THPT Hoàng Hoa Thám-2018) Cho hàm số
fx
liên tục, không âm trên đoạn
0;
2
, thỏa
mãn
03f
và
2
. cos . 1
f x f x x f x
,
0;
2
x
. Tìm giá trị nhỏ nhất
m
và giá trị
lớn nhất
M
của hàm số
fx
trên đoạn
;
62
.
A.
21
2
m
,
22M
. B.
5
2
m
,
3M
. C.
5
2
m
,
3M
. D.
3m
,
22M
.
Lời giải
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Câu 88.(THPT Kinh Môn 2018) Giả sử hàm số
()fx
liên tục, dương trên ; thỏa mãn
01f
và
2
1
fx
x
f x x
. Khi đó hiệu
2 2 2 1T f f
thuộc khoảng
A.
2;3
B.
7;9
. C.
0;1
D.
9;12
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Lời giải
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Câu 89.(Nguyễn Tất Thành Yên Bái) Cho hàm số
y f x
có đạo hàm liên tục trên khoảng
0;
, biết
2
2 1 0f x x f x
,
0x
và
1
2
6
f
. Tính giá trị của biểu thức
1 2 ... 2019P f f f
.
A.
2021
2020
. B.
2020
2019
. C.
2019
2020
. D.
2018
2019
.
Lời giải
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Câu 90.(THPT Chuyên Thái Bình) Cho hàm số
y f x
đồng biến trên
0;
;
y f x
liên tục,
nhận giá trị dương trên
0;
và thỏa mãn
2
3
3
f
và
2
' 1 .f x x f x
. Mệnh đề nào
dưới đây đúng?
A.
2
2613 8 2614f
. B.
2
2614 8 2615f
.
C.
2
2618 8 2619f
. D.
2
2616 8 2617f
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 91.Cho hàm số
fx
nhận giá trị dương, có đạo hàm liên tục trên
0;
thỏa mãn
1
2
15
f
và
2
2 4 0f x x f x
. Tính
1 2 3f f f
.
A.
7
15
. B.
11
15
. C.
11
30
. D.
7
30
.
Lời giải
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Loại 2.
( ). ( ) ( )
n
f x f x p x
(tích)
1. Phương pháp.
Bước 1. Lấy nguyên hàm hai vế ta được
( ). ( )d ( )d
n
f x f x x p x x
.
Bước 2. Đặt
t f x dt f x dx
Bước 3. Tìm nguyên hàm
dt ( )d
n
t p x x
theo biến
t
rồi trả lại biến
.x
2. Bài tập minh họa.
Câu 92.(THPT Đoàn Thượng) Cho hàm số
y f x
thỏa mãn
42
.f x f x x x
. Biết
02f
.
Tính
2
2f
.
A.
2
313
2
15
f
. B.
2
332
2
15
f
. C.
2
324
2
15
f
. D.
2
323
2
15
f
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 93. Cho hàm số
fx
thỏa
52
3 6 .f x f x x x
Biết rằng
0 2,f
tính
2
2.f
A.
2
2 64.f
B.
2
2 81.f
C.
2
2 100.f
D.
2
2 144.f
Lời giải.
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Câu 94.Cho hàm số
fx
có đạo hàm
'fx
liên tục và nhận giá trị không âm trên
1; ,
thỏa
1 0,f
2
2
2
. 4 4 1
fx
e f x x x
với mọi
1; .x
Mệnh đề nào sau đây đúng?
A.
1 4 0.f
B.
0 4 1.f
C.
1 4 2.f
D.
2 4 3.f
Lời giải.
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Câu 95.(Chuyên Ngoại Ngữ Hà Nội) Cho hàm số
y f x
liên tục và có đạo hàm trên đoạn
1;0
,
đồng thời thỏa mãn điều kiện
2
3 2 , 1;0
fx
f x x x e x
. Tính
01A f f
.
A.
1.A
B.
1
.A
e
C.
1.A
D.
0.A
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Loại 3. Sử dụng đạo hàm của tích khi biểu thức có dạng
)( ) ( )( ) ( ) (u xxuf x f h xx
hoặc
2
(( ) ( )
()
( ) )uxf x f x
hx
f
x
x
u
1. Phương pháp.
Bước 1. Biến đổi biểu thức về dạng
)( ) ( ) ( )[]( ) ( ) ( ( ) ( )f x f x hu x f x xx u x u x h
Bước 2. Khi đó lấy nguyên hàm hai vế
([ )( () ( ) ( )] [ ]) ( )u x u xf x h x f x h x ddx x
( ) ( ) ( )du x f x h x x
Bước 3. Tìm hàm
.fx
Chú ý:
2
(()()
)
) ()
(
u
x
u
x u x
x
f x f x
h x h
f x f x
2. Bài tập minh họa.
Câu 96.(Sở Ninh Bình 2019) Cho hàm số
()fx
thỏa mãn
(1) 3f
và
(4 '( )) ( ) 1x f x f x
với mọi
0x
. Tính
(2)f
.
A.
6
. B.
2
. C.
5
. D.
3
.
Lời giải
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Câu 97.(Đặng Thành Nam)Cho hàm số
fx
có đạo hàm trên
\0
thỏa mãn
2
fx
f x x
x
và
11f
. Giá trị của
3
2
f
bằng
A.
1
96
. B.
1
64
. C.
1
48
. D.
1
24
.
Lời giải
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
98
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 98.(Chuyên Đại Học Vinh) Cho hàm số
fx
thỏa mãn
2
4
. 15 12f x f x f x x x
,
x
và
0 0 1ff
Giá trị của
2
1f
bằng:
A.
9
2
. B.
5
2
. C.
10
. D.
8
.
Lời giải
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Câu 99.(Cầu Giấy Hà Nội 2019) Cho hàm số
y f x
có đạo hàm cấp hai trên
0;
thỏa mãn
2
2 cos , 0; ; 4 0
xf x f x x x x x f
. Giá trị biểu thức
9f
là:
A.
0
. B.
3
. C.
. D.
2
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Câu 100.(THPT Chuyên ĐH Vinh 2018) Cho hàm số
y f x
có đạo hàm liên tục trên
1;2
thỏa
mãn
14f
và
32
23f x xf x x x
. Tính
2f
A.
5
. B.
20
. C.
10
. D.
15
.
Lời giải
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Câu 101.(KHTN Hà Nội Lần 3)Cho hàm số
fx
liên tục trên đoạn
0;4
thỏa mãn
2
2
3
21
fx
f x f x f x
x
và
0fx
với mọi
0;4x
. Biết rằng
0 0 1
ff
, giá
trị của
4f
bằng
A.
2
e
. B.
2e
. C.
3
e
. D.
2
1e
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Loại 4.
( ) . ( )()f x f x h xux
(thương)
1. Phương pháp.
Bước 1. Nhân hai vế của biểu thức với
( )dp x x
e
ta được
( )d ( )d ( )d
( ) . (( ). )
u x x u x x u x x
e u x ef x f x h xe
( )d ( )d
()
u x x u x x
f x he xe
Bước 2. Từ đó suy ra
( )d ( )d
()
u x x u x x
e e dxf x h x
Bước 3. Tìm nguyên hàm để tìm hàm số
.fx
Đặt biệt:
( ) ( ) ( )f x f x h x
( ) ( ) ( ) ( ) ( ). . . . .
x x x x x
e f x e f x e h x e f x e h x
(nhân với
x
e
)
( ) ( ) ( )f x f x h x
( ) ( ) ( ) ( ) (. ). . . .
x x x x x
e f x e f x e h x e f x e h x
(nhân với
x
e
2. Bài tập minh họa.
Câu 102.(Chuyên ĐH Vinh) Cho hàm số thỏa mãn và .
Tất cả các nguyên hàm của là
A. . B. . C. . D. .
Lời giải
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Câu 103. (Chuyên ĐH Vinh) Cho hàm số thỏa mãn và
. Tất cả các nguyên hàm của là
A. . B. . C. . D. .
Lời giải
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fx
e,
x
f x f x x
02f
2
e
x
fx
2 e e
xx
xC
2
2 e e
xx
xC
1e
x
xC
1e
x
xC
fx
2
2 2 ,
x
f x xf x xe x
01f
2
.e
x
x f x
2
2
1xC
2
2
2
1
1
2
x
x e C
2
2
2
1
x
x e C
2
2
1
1
2
xC
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III–Nguyên Hàm-Tích phân -Ứng Dụng
101
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 104.(Chuyên Thái Bình)Cho
()fx
là hàm số liên tục trên thỏa mãn
,f x f x x x
và
01f
. Tính
1f
.
A.
2
e
. B.
1
e
. C.
e
. D.
e
2
.
Lời giải
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Câu 105. Biết rằng là một nguyên hàm của trên khoảng . Gọi là một
nguyên hàm của thỏa mãn , giá trị của bằng
A. . B. . C. . D. .
Lời giải
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e
x
x
fx
;
Fx
e
x
fx
01F
1F
7
2
5e
2
7e
2
5
2
-Bài 3. Tích Phân
102
Tel: 0935.660.880
Nu cn tính din tích mt hình phc bao bn
thng ta ch vic chia hình phc
nht... là nhng hình
t cách tính din tích.
ta cn tính din tích hình phng bao
c
thành các hình nh m mt s hình ch nht,
hình tam giác... và các hình thang cong.
Tích phân giúp ta tính di
Cho
fx
K
và
, ab
K
Fx
fx
trên
K
F b F a
fx
a
b
và kí
d
b
b
a
a
f x x F x F b F a
.
. Tính các tích phân sau:
a).
1
3
0
1dI x x x
. b).
2
2
3dI x x x
.
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. Tính các tích phân sau:
a).
1
3
0
dI x x x x
. b).
2
1
1 1 dI x x x x
.
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. TÍCH PHÂN
-Bài 3. Tích Phân
103
Tel: 0935.660.880
..........................................................................................................................................................................................................
.........................................................................................................................................................................................................
. Tính các tích phân sau:
a).
2
23
1
11
dIx
xx
. b).
2
2
1
11
d
e
I x x x
xx
.
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Ví . Tính các tích phân sau:
a).
1
2
0
75
d
1
xx
Ix
x
. b).
1
2
2
0
2 5 4
d
44
xx
Ix
xx
.
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0
d0
a
a
f x x
.
dd
ba
ab
f x x f x x
.
dd
bb
aa
kf x x k f x x
(
k
d d d
b b b
a a a
f x g x x f x x g x x
.
d d d
b c b
a a c
f x x f x x f x x
.
-Bài 3. Tích Phân
104
Tel: 0935.660.880
Chú ý: Tích phân
d
b
a
f x x
f
, ab
x
là
dd
bb
aa
f x x f t t
.
.
2
1
d4f x x
,
5
1
d6f x x
và
5
1
d8g x x
. Hãy tính
a).
5
2
df x x
. b).
2
1
3df x x
.
c).
5
1
df x g x x
. d).
5
1
4df x g x x
.
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II. PHÂN
1.
d
b
a
I f x x
x u t
ut
;
,
f u t
;
và
, u a u b
,
.
Thay vào, ta có
. ' d dI f u t u t t g t t G t G G
.
Cách chn
22
ax
sin ;
22
cos 0;
x a t t
x a t t
-Bài 3. Tích Phân
105
Tel: 0935.660.880
22
xa
, \ 0
sin 2 2
0, \
cos 2
a
xt
t
a
xt
t
22
xa
tan ;
22
x a t t
. Tính các tích phân sau:
a).
8
2
0
16 d .I x x
b).
3
22
1
1
d.
4
Ix
xx
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2. .
d
b
a
I f x x
.'f x g u x u x
d ' dt u x t u x x
. :
.
x a t u a
x b t u b
Thay vào ta có
()
()
.d
ub
ub
ua
ua
I g t t G t
7. Tính các tích phân sau:
-Bài 3. Tích Phân
106
Tel: 0935.660.880
a).
1
2
0
d.
1
x
Ix
x
b).
3
2
3
0
2
d.
1
x
Ix
x
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3
a).
u
và
v
;ab
;ab
.
d d .
b
bb
aa
a
u v uv v u
u
dv
Dng 1
ln df x g x x
ln
dd
u g x
v f x x
Dng 2
sin
cos d
ax
ax
f x ax x
e
t
sin
d cos d
ax
u f x
ax
v ax x
e
Dng 3
sin
d
cos
ax
ax
ex
ax
t
sin
cos
dd
ax
ax
u
ax
v e x
u
''
''
.
2
trong
4
u
là
dv
.
. Tính các tích phân sau:
a).
2
3
1
ln
d.
x
Ix
x
b).
1
0
1 d .
x
I x e x
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-Bài 3. Tích Phân
107
Tel: 0935.660.880
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B.
1.
tích mt tích phân bn ta tic.
c 1. Tính nguyên hàm da vào các k thut tìm nguyên hàm.
c 2. Áp dng công thc tính tích phân
d
b
b
a
a
f x x F x F b F a
.
2.
Bài tp 1. Tính các tích phân sau:
a).
1
32
0
x
I e dx
. b).
1
0
d
x
I e x x
.
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Bài tp 2. Tính các tích phân sau:
a).
ln2
21
0
1
d
x
x
e
Ix
e
. b).
2
1
0
29
d
x
x
Ix
e
.
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-Bài 3. Tích Phân
108
Tel: 0935.660.880
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Bài tp 3. Tính các tích phân sau:
a).
2
3
2sin 3cos dI x x x x
. b).
2
1
3
2sin 3 d .
6
x
I x x
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Bài tp 4. Tính các tích phân sau:
a).
2
0
sin3 cos2 d .I x x x
b).
2
2
0
cos cos2 d .I x x x
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-Bài 3. Tích Phân
109
Tel: 0935.660.880
Bài tp 5.
x
0;
2
0
2
1
2sin 1 d
4
x
tt
.
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Bài tp 6. Tính các tích phân sau:
a).
2
1
7 2 5
d.
e
xx
Ix
x
b).
22
3
3
1
3 5dI x x
.
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3.
Bài 1. Tính các tích phân sau:
a).
3
2
0
1 cos 2cos d .I x x x
b).
3
0
sin3 cos d .I x x x
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-Bài 3. Tích Phân
110
Tel: 0935.660.880
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Bài 2. Cho
3
1
d2f x x
và
3
1
d3g x x
. Hãy tính
a).
3
1
3 d .A f x g x x
b).
3
1
5 4 d .B f x x
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Bài 3. Tìm
b
0
2 4 d 0.
b
xx
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Bài 4. Tìm
x
3
;
44
mãn
4
cos2
d cos2 2.
sin cos
x
t
tx
tt
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-Bài 3. Tích Phân
111
Tel: 0935.660.880
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4. .
.
Câu 1.(THPT -Hà Cho
y f x
,
y g x
;ab
k
A.
dd
ba
ab
f x x f x x
. B.
dd
bb
aa
xf x x x f x x
.
C.
d0
a
a
kf x x
. D.
d d d
b b b
a a a
f x g x x f x x g x x
.
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Câu 2. sai?
A.
ddd
b b b
a a a
f x fg x x x g xx x
. B.
d d d
b b c
a c a
f x f x fx x xx
.
C.
dd
ba
ab
xf x f x x
. D.
dd
bb
aa
tf f txx
.
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Câu 3.(THPT Phú
fx
;ab
và
Fx
fx
sai.
A.
d
b
a
f x x F a F b
. B.
d0
a
a
f x x
.
C.
dd
ba
ab
f x x f x x
. D.
d
b
a
f x x F b F a
.
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Câu 4. Cho
fx
;ab
và
;c a b
.
-Bài 3. Tích Phân
112
Tel: 0935.660.880
A.
d d d
c b a
a c b
f x x f x x f x x
. B.
d d d
b c b
a a c
f x x f x x f x x
.
C.
d d d
b c c
a a c
f x x f x x f x x
. D.
d d d
b a b
a c c
f x x f x x f x x
.
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Câu 5.(THPT Chuyên Quang
f
K
và
, , a b c
K
sai?
A.
1
a
a
f x dx
. B.
ba
ab
f x dx f x dx
.
C.
, ;
c b b
a c a
f x dx f x dx f x dx c a b
. D.
bb
aa
f x dx f t dt
.
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Câu 6.(THPT Phú 2018) sai ?
A.
ddd
b b b
a a a
f x fg x x x g xx x
. B.
d d d
b b c
a c a
f x f x fx x xx
.
C.
dd
ba
ab
xf x f x x
. D.
dd
bb
aa
tf f txx
.
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Câu 7.(TT Cho
2
0
d3I f x x
2
0
4 3 dJ f x x
A.
2
. B.
6
. C.
8
. D.
4
.
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Câu 8.(THPT Chuyên Hoàng
2
1
d3f x x
,
5
2
d1f x x
thì
5
1
df x x
A.
2
. B.
2
. C.
3
. D.
4
.
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-Bài 3. Tích Phân
113
Tel: 0935.660.880
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Câu 9.(THPT Kinh Môn 2-
fx
0;10
và
10
0
d7f x x
và
6
2
d3f x x
. Tính
2 10
06
ddP f x x f x x
.
A.
7P
. B.
4P
. C.
4P
. D.
10P
.
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Câu 10.(THPT Ninh Giang-
9
0
d 37f x x
và
0
9
d 16g x x
.
9
0
2 3 ( ) dI f x g x x
:
A.
26I
. B.
58I
. C.
143I
. D.
122I
.
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Câu 11.(THPT Hoàng Hoa Thám- Yên)
fx
có
fx
1;3
,
13f
và
3
1
( )d 10f x x
3f
A.
13
. B.
7
. C.
13
. D.
7
.
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Câu 12.(THPT Kinh Môn- Cho hàm
fx
2;3
22f
,
35f
3
2
dfxx
A.
3
. B.
7
. C.
10
D.
3
.
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Câu 13.(THPT Bàng) Cho
fx
1;4
,
4 2018f
,
4
1
d 2017f x x
. Tính
1f
?
A.
11f
. B.
11f
. C.
13f
. D.
12f
.
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-Bài 3. Tích Phân
114
Tel: 0935.660.880
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Câu 14. GD &
8
1
d2f x x
;
4
1
d3f x x
;
4
1
d7g x x
sai?
A.
8
4
d1f x x
. B.
4
1
d 10f x g x x
.
C.
8
4
d5f x x
. D.
4
1
4 2 d 2f x g x x
.
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Câu 15. Cho
fx
và có
1
0
d2f x x
;
3
1
d6f x x
.
Tính
3
0
dI f x x
.
A.
8I
. B.
12I
. C.
36I
. D.
4I
.
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Câu 16.(THPT Ngc To - Hà Ni) Cho
d7
b
a
f x x
và
5fb
fa
bng
A.
12
. B.
0
. C.
2
. D.
2
.
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Câu 17. GD Và - 2018)
fx
0;1
và
1 0 2ff
.
Tính tích phân
1
0
df x x
.
A.
1I
. B.
1I
. C.
2I
. D.
0I
.
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Câu 18.(THPT -2018) Cho
fx
và
gx
1;3
, mãn:
3
1
3 d 10f x g x x
và
3
1
2 d 6f x g x x
. Tính
3
1
dI f x g x x
A.
8I
. B.
9I
. C.
6I
. D.
7I
.
-Bài 3. Tích Phân
115
Tel: 0935.660.880
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Câu 19.(THPT Kinh Môn)
fx
0;10
và
10
0
d7f x x
và
6
2
d3f x x
. Tính
2 10
06
ddP f x x f x x
.
A.
7P
. B.
4P
. C.
4P
. D.
10P
.
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Câu 20.(SGD Tháp-2018)
fx
và
Fx
F x f x
,
x
. Tính
1
0
df x x
02F
và
15F
.
A.
1
0
d3f x x
. B.
1
0
d7f x x
. C.
1
0
d1f x x
. D.
1
0
d3f x x
.
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Câu 21.(SGD Tháp-2018)
2
0
d3f x x
và
2
0
d2g x x
.
Tính tích phân
2
0
2 2 dI x f x g x x
.
A.
18I
. B.
5I
. C.
11I
. D.
3I
.
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Câu 22.(THPT - Tích phân
3
2
4
d
sin
x
I
x
A.
cot cot
34
. B.
cot cot
34
. C.
cot cot
34
. D.
cot cot
34
.
-Bài 3. Tích Phân
116
Tel: 0935.660.880
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Câu 23.(THPT Chuyên Biên Hòa-Hà Nam)
2
3
cos 3xdx a b
a
,
b
hu
26T a b
.
A.
3T
. B.
1T
C.
4T
. D.
2T
.
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Câu 24.(THPT Chuyên Biên Hòa-Hà Nam) Tính
1
3
0
.e d
x
Ix
.
A.
3
e1I
. B.
e1I
. C.
3
e1
3
. D.
3
1
e
2
I
.
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Câu 25.(THPT -Quãng Ngãi) Tính tích phân:
2
1
1
d
x
Ix
x
.
A.
1 ln 2I
. B.
2ln 2I
. C.
1 ln 2I
. D.
7
4
I
.
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Câu 26.(THPT Chuyên Thái Bình) Tính
1
0
1
3d
21
I x x
x
.
A.
2 ln 3
. B.
4 ln3
. C.
2 ln3
. D.
1 ln 3
.
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Câu 27.(THPT Chuyên Long-Quãng Ninh) Tính tích phân
0
sin3 dxx
.
A.
1
3
. B.
1
3
. C.
2
3
. D.
2
3
.
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-Bài 3. Tích Phân
117
Tel: 0935.660.880
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Câu 28.ng Bng Sông cu Long) Tính tích phân
2
0
sin d
4
I x x
.
A.
4
I
. B.
1I
. C.
0I
. D.
1I
.
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Câu 29.(THPT Thành 2)
0
3
1
d
1
x
x
A.
2ln2
. B.
2ln 2 1
. C.
ln 2
. D.
2ln2
.
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Câu 30.(THPT Phú
2018
0
2d
x
Ix
A.
2018
21
. B.
2018
21
ln 2
. C.
2018
2
ln2
. D.
2018
2
.
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Câu 31.Tích phân
0
1
1
d
12
x
x
A.
13
. B.
31
. C.
31
. D.
31
.
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Câu 32. GD- Gia Lai -2018) Tính tích phân
1
0
d
32
x
I
x
A.
1
ln3
2
. B.
ln3
. C.
1
ln3
2
. D.
1
log3
2
.
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-Bài 3. Tích Phân
118
Tel: 0935.660.880
Câu 33.-2018) Tích phân
1
0
d
x
ex
A.
1e
. B.
1
1
e
. C.
1e
e
. D.
1
e
.
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Câu 34.-2018) Tính tích phân
e
2
1
1
d
x
Ix
x
.
A.
1
1
e
I
. B.
1
2
e
I
. C.
1
2
e
I
. D.
1
1
e
I
.
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Câu 35. Chính 2018)
2
1
23
dx
x
A.
7
2ln
5
. B.
1
ln35
2
. C.
7
ln
5
. D.
17
ln
25
.
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. T
Câu 36.(THPT Tây An Thái Bình) Cho
2
1
3 2 d 1f x g x x
,
2
1
2 d 3f x g x x
.
2
1
df x x
A.
11
7
. B.
5
7
. C.
6
7
. D.
16
7
.
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Câu 37.-
fx
2; 3
Fx
fx
2; 3
. Tính
2
1
2dI f x x x
11F
và
24F
.
A.
6I
. B.
10I
. C.
3I
. D.
9I
.
-Bài 3. Tích Phân
119
Tel: 0935.660.880
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Câu 38.(THPT Bình Xuyên-2018)
10
0
d 17f z z
và
8
0
d 12f t t
thì
10
8
3df x x
A.
15
. B.
29
. C.
15
. D.
5
.
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Câu 39.
y f x
;ab
d5
d
a
f x x
và
d2
d
b
f x x
a d b
)
thì
d
b
a
f x x
A.
3
. B.
7
. C.
5
2
. D.
10
.
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Câu 40. Cho
fx
,
gx
1;1
và
fx
gx
1
0
d5f x x
;
1
0
d7g x x
sai?
A.
1
1
d 10f x x
. B.
1
1
d 10f x g x x
.
C.
1
1
d 10f x g x x
. D.
1
1
d 14g x x
.
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Câu 41. Cho
1
2
d3f x x
. Tính tích phân
1
2
2 1 dI f x x
.
A.
9
B.
3
C.
3
D.
5
-Bài 3. Tích Phân
120
Tel: 0935.660.880
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Câu 42. Tích phân
2
2
1
3dxx
A.
61
B.
61
3
C.
4
D.
61
9
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Câu 43.(THPT Chuyên Tính tích phân
1
2018
0
1dI x x x
A.
11
2018 2019
I
. B.
11
2020 2021
I
. C.
11
2019 2020
I
. D.
11
2017 2018
I
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Câu 44. GD VÀ Hà Nam-2018) Tích phân
4
0
cos d
2
xx
A.
12
2
. B.
12
. C.
21
2
. D.
21
.
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Câu 45.-2018)
2
0
2 1 sin dx x x
1
1
ab
a
,
b
sai?
A.
28ab
. B.
5ab
. C.
2 3 2ab
. D.
2ab
.
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-Bài 3. Tích Phân
121
Tel: 0935.660.880
Câu 46.(THPT Chuyên Hoàng
a
,
b
sinf x a x b
12f
và
1
0
d4f x x
.
A.
2
a
,
2b
. B.
2
a
,
2b
. C.
a
,
2b
. D.
a
,
2b
.
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Câu 47.Cho tích phân
0
3
cos2 cos4 d 3x x x a b
a
,
b
là các
2
e log
a
b
.
A.
2
. B.
3
. C.
1
8
. D.
0
.
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Câu 48.(THPT Tây AnhThái Bình) Tính
8sin3 cos d cos4 cos2I x x x a x b x C
.
ab
A.
3
. B.
1
. C.
1
. D.
2
.
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Câu 49.(Chuyên Thái Nguyên-2018) Cho tích phân
2
0
1
4 1 cos dx x x c
ab
,
,,abc
.
Tính
a b c
A.
1
2
. B.
1
. C.
2
. D.
1
3
.
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Câu 50. Bình
b
1
2 6 d 0
b
xx
?
A.
0b
h
3b
. B.
0b
h
1b
C.
5b
0b
. D.
1b
5b
.
-Bài 3. Tích Phân
122
Tel: 0935.660.880
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Câu 51.(PTNK-TP HCM) Cho
2
2
0
2dI x x m x
và
1
2
0
2dJ x mx x
m
IJ
.
A.
3m
. B.
2m
. C.
1m
. D.
0m
.
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Câu 52.(THPT Quãng 1-Thanh Hóa)
2
1
2 1 dI mx x
(
m
m
4I
.
A.
1m
. B.
2m
. C.
1m
. D.
2m
.
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Câu 53.(THPT Chuyên Quang
a
0
2 5 d 4
a
x x a
A.
1
. B.
0
. C.
2
. D.
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Câu 54.(THPT Chuyên Thái Bình) Cho hàm s
2
3 khi 0 1
4 khi 1 2
xx
y f x
xx
. Tính tích phân
2
0
df x x
.
A.
7
2
. B.
1
. C.
5
2
. D.
3
2
.
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-Bài 3. Tích Phân
123
Tel: 0935.660.880
Câu 55.(THPT Chuyên Hùng Gia Lai)
2
khi 0 1
1
2 1 khi 1 3
x
y f x
x
xx
. Tính
tích phân
3
0
df x x
.
A.
6 ln4
. B.
4 ln 4
. C.
6 ln2
. D.
2 2ln 2
.
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Câu 56.(THPT Chuyên Vinh)
2
2
ab
fx
xx
,ab
1
1
2
d 2 3ln2f x x
. Tính
T a b
.
A.
1T
. B.
2T
. C.
2T
. D.
0T
.
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Câu 57. -2018)
5
2
3
1
d ln
12
x x b
xa
x
a
,
b
Tính
2S a b
.
A.
2S
. B.
5S
. C.
2S
. D.
10S
.
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Câu 58.-
0
2
1
3 5 1 2
d ln
23
xx
x a b
x
2ab
là
A.
30
. B.
60
. C.
50
. D.
40
.
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-Bài 3. Tích Phân
124
Tel: 0935.660.880
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Câu 59. GD- Trà Vinh 2018)
1
1
3
5
d ln
22
x
x a b
x
a
,
b
?
A.
8
81
ab
. B.
7
24
ab
. C.
9
8
ab
. D.
3
10
ab
.
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Câu 60.Cho
1
0
23
d ln2
2
x
x a b
x
(
a
và
b
a
là
A.
7
. B.
7
. C.
5
. D.
5
.
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Câu 61.(Chuyên Thái Bình-2018) Tính
1
0
1
3d
21
I x x
x
.
A.
2 ln 3
. B.
4 ln3
. C.
2 ln3
. D.
1 ln 3
.
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Câu 62. Cho
1
0
11
ln2 ln3
12
dx a b
xx
a
,
b
?
A.
2ab
. B.
20ab
. C.
2ab
. D.
20ab
.
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-Bài 3. Tích Phân
125
Tel: 0935.660.880
Câu 63.(THPT Ninh Giang-
5
2
1
3
d ln5 ln2 ,
3
x a b a b Z
xx
A.
20ab
. B.
20ab
. C.
0ab
. D.
0ab
.
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Câu 64.(THPT Lê Quý -Hà phân
2
1
2
0
1
d ln
1
x
I x a b c
x
a
,
b
,
c
abc
?
A.
3
. B.
0
. C.
1
. D.
2
.
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Câu 65.(T 6)
1
32
0
2 3 1 3
d ln
22
xx
xb
xa
,0ab
k
2
8
1 2017
d lim
2018
ab
x
kx
x
x
.
A.
0k
. B.
0k
. C.
0k
. D.
k
.
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Câu 66. GD &
3
2
2
2
d ln5 ln3 3ln2
2 3 1
x
x a b
xx
,ab
2P a b
là
A.
1P
. B.
7P
. C.
15
2
P
. D.
15
2
P
.
-Bài 3. Tích Phân
126
Tel: 0935.660.880
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Câu 67. GD-
fx
\0
24
1
fx
xx
,
1fa
,
2fb
12ff
A.
ba
. B.
ab
. C.
ab
. D.
ab
.
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Câu 68. GD - Tính tích phân
1
2
0
d
9
x
I
x
.
A.
11
ln
62
I
. B.
11
ln
62
I
. C.
1
ln2
6
I
. D.
6
ln 2I
.
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Câu 69.(THPT A-2018) Cho
3
2
2
8
d ln2 ln5
2
x
x a b
xx
a
,
b
A.
3ab
. B.
2 11ab
. C.
5ab
. D.
2 11ab
.
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-Bài 3. Tích Phân
127
Tel: 0935.660.880
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Câu 70.
3
0
d
ln2 ln5 ln7
24
x
a b c
xx
,
,,abc
23a b c
A.
5
. B.
4
. C.
2
. D.
3
.
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3.
Câu 71.(THPT -Hà Tích phân
2
2
0
min ,3 2 dx x x
A.
2
3
. B.
11
6
. C.
2
3
. D.
17
6
.
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Câu 72.
k
0
1
11
2 1 d 4lim .
k
x
x
xx
x
A.
1
.
2
k
k
B.
1
.
2
k
k
C.
1
.
2
k
k
D.
1
.
2
k
k
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-Bài 3. Tích Phân
128
Tel: 0935.660.880
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Câu 73.(THPT -
y f x
0;3
và
3
0
d4I f x x
3
1 ln
0
4d
fx
K e x
là:
A.
4 12e
. B.
12 4e
. C.
3e 14
. D.
14 3e
.
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Câu 74.(THPT
6
2
0
3
3 4sin d
6
ac
xx
b
a
,
b
a
b
abc
.
A.
8
. B.
16
. C.
12
. D.
14
.
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Câu 75.(THPT Chuyên Thái Bình) Cho
Fx
1
1 sin2
y
x
\,
4
x k k
01F
;
( ) 0F
. Tính
11
12 12
P F F
.
A.
23P
. B.
0P
. C.
P
. D.
1P
.
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-Bài 3. Tích Phân
129
Tel: 0935.660.880
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Câu 76. Bình
4
2
3
24
d
2
x x a b
Ix
c
xx
a
,
b
,
c
abc
.
A.
39
. B.
27
. C.
33
. D.
41
.
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Câu 77.(THPT Thúc - An)
3
2
2
14
d
1
x x a b
x
c
xx
a
,
b
,
c
T a b c
.
A.
31
. B.
29
. C.
33
. D.
27
.
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-Bài 3. Tích Phân
130
Tel: 0935.660.880
Câu 78.(THPT Chuyên Vinh)
4
2
1
1e
d e e
4
e
x
bc
x
x
xa
x
x
a
,
b
,
c
nguyên. Tính
T a b c
.
A.
3T
. B.
3T
. C.
4T
. D.
5T
.
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Câu 79. chí THTTTháng 4)
2
1
d
ln
x
x
g x t
t
0x
gx
là
A.
1
ln
x
gx
x
. B.
1
ln
x
gx
x
. C.
1
ln
gx
x
. D.
lng x x
.
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Câu 80.(THPT Chuyên Hùng
m
2
0
d
m
x x x
có giá
A.
1m
. B.
2m
. C.
3m
. D.
4m
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-Bài 3. Tích Phân
131
Tel: 0935.660.880
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Câu 81. GD & Cho
M
,
N
.sinπ .cos πf x M x N x
13f
và
1
2
0
1
d
π
f x x
1
4
f
A.
5π2
2
. B.
5π2
2
. C.
π2
2
. D.
π2
2
.
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Câu 82. -2018)
2
2
1
d 1 1
4 4 1
x
x x a b
a
,
b
7;3
thì
a
và
b
A.
2
2 1 0xx
. B.
2
4 12 0xx
. C.
2
5 6 0xx
. D.
2
90x
.
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Câu 83. -2018)
2
f x ax bx c
1
0
7
d
2
f x x
,
2
0
d2f x x
và
3
0
13
d
2
f x x
a
,
b
,
c
P a b c
.
A.
3
4
P
. B.
4
3
P
. C.
4
3
P
. D.
3
4
P
.
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-Bài 3. Tích Phân
132
Tel: 0935.660.880
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Câu 84.-2018) Cho
Fx
11f x x x
13F
.
0 2 3F F F
.
A.
8
. B.
12
. C.
14
. D.
10
.
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Câu 85.(SGD Giang - 2018) Cho
1
2
1
3
d2
3 9 1
x
x a b
xx
a
,
b
a
là:
A.
26
27
. B.
26
27
. C.
27
26
. D.
25
27
.
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.
Câu 86.(THPT Thành 2 Ninh)
n
2
2 2 3 1
0
1 2 3 4 ... d 2
n
n x x x nx x
?
A.
1
. B.
2
. C.
0
. D.
3
.
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-Bài 3. Tích Phân
133
Tel: 0935.660.880
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.
1.
tích mt s tích phân có dng .
22
ax
t
sin ;
22
.
cos 0;
x a t t
x a t t
22
xa
, \ 0
sin 2 2
.
0, \
cos 2
a
xt
t
a
xt
t
22
xa
tan ;
22
x a t t
2.
Bài tp 7. Tính các tích phân sau:
a).
2
2
1
5 4 d .I x x x
b).
2
2
0
2 d .I x x x x
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-Bài 3. Tích Phân
134
Tel: 0935.660.880
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Bài tp 8. Tính các tích phân sau:
a).
3
2
3
1
d.
3
Ix
x
b).
1
3
2
0
d
.
1
x
I
x
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Bài tp 9. Tính các tích phân sau:
a).
3
2
1
d
.
1
x
I
xx
b).
3
2
2
2
3
2
92
d.
x
Ix
x
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-Bài 3. Tích Phân
135
Tel: 0935.660.880
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Bài tp 10. Tính các tích phân sau:
a).
2
2
2
3
d
.
1
x
I
xx
b).
2
2
3
1
1
d.
x
Ix
x
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3. .
. .
Câu 87. (THPT Kim Liên-HN) Tính tích phân
1
2
0
2
d
4
Ix
x
bt
2sinxt
. M
A.
4
0
2dIt
. B.
6
0
dIt
. C.
3
0
dIt
. D.
1
0
2dIt
.
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-Bài 3. Tích Phân
136
Tel: 0935.660.880
Câu 88.()
Oxyz
cho
E
22
22
1, , 0
xy
ab
ab
22
: 7.C x y
E
C
A.
77ab
. B.
49ab
. C.
7ab
. D.
7ab
.
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Câu 89. (Gang Thép Thái Nguyên) Cho tích phân
22
2
0
16 dI x x
và
4sinxt
. M nào sau
A.
4
0
8 1 cos2 dI t t
. B.
4
2
0
16 sin dI t t
C.
4
0
8 1 cos2 dI t t
. D.
4
2
0
16 cos dI t t
.
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Câu 90.(THPT c Th-Hà i bin
3 tanxt
, tích phân
1
2
0
d
3
x
I
x
tr thành tích
phân nào?
A.
3
0
3dIt
. B.
6
0
3
d
3
It
C.
6
0
3dI t t
. D.
6
0
1
dIt
t
.
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-Bài 3. Tích Phân
137
Tel: 0935.660.880
Câu 91.(Chuyên Lê Hng Phong Nam nh) Giá tr ca
3
2
0
9d
a
xx
b
, ab
và
a
b
là phân s ti gin. Tính giá tr ca biu thc
T ab
.
A.
35T
. B.
24T
. C.
12T
. D.
36T
.
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Câu 92.(THPT Ngc To HN-2018) Bit rng
1
2
1
2
4d
3
x x a
a
bng:
A.
2
. B.
1
. C.
3
. D.
2
.
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Câu 93.(-2018) i bin
2sinxt
thì tích phân
1
2
0
d
4
x
x
tr thành
A.
6
0
dtt
. B.
3
0
dtt
. C.
6
0
dt
t
. D.
6
0
dt
.
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
138
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
DẠNG 3. Phương Pháp đổi biến loại 2.
1. Dấu hiệu.
Khi hàm
fx
là hàm hợp có dạng tổng quát
. ' .f x g u x u x
Một số dạng thường gặp:
Căn thức
.f u x u x
hoặc
ux
f u x
.
Lũy thừa
.
n
f x f x
Lôgarít
ln
n
x
x
.
2. Phương pháp.
Để tính tích phân
d
b
a
I f x x
nếu
.'f x g u x u x
, ta thực hiện phép đổi biến như sau:
Bước 1. Đặt
d ' dt u x t u x x
. Đổi cận:
.
x a t u a
x b t u b
Bước 2. Thay vào ta có
()
()
.d
ub
ub
ua
ua
I g t t G t
3. Bài tập minh họa.
Bài tập 7. Tính các tích phân sau:
a).
1
2
0
2 d .I x x x
b).
2
3
2
0
4 d .I x x x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
139
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
Bài tập 8. Tính các tích phân sau:
a).
3
2
0
4
d.
1
x
Ix
x
b).
1
2
3
3
0
d.
19
x
Ix
x
Lời giải
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Bài tập 9. Tính các tích phân sau:
a).
1
32
0
2 d .I x x x
b).
2
35
0
1 d .I x x x
Lời giải
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140
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Bài tập 10. Tính các tích phân sau:
a).
3
3
2
0
d.
1
x
Ix
x
b).
7
3
3
2
0
d.
1
x
Ix
x
Lời giải
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Bài tập 11. Tính các tích phân sau:
a).
3
2
0
1
d.
1
x
Ix
x
b).
3
53
2
0
2
d.
1
xx
Ix
x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
141
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
Bài tập 12. Tính các tích phân sau:
a).
4
2
7
1
d.
9
Ix
xx
b).
2
3
1
1
d.
1
Ix
xx
Lời giải
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Bài tập 13. Tính các tích phân sau:
a).
2
1
d.
11
x
Ix
x
b).
4
0
41
d.
2 1 2
x
Ix
x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
142
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 14. Tính các tích phân sau:
a).
6
2
d
.
2 1 4 1
x
I
xx
b).
10
5
d
.
21
x
I
xx
Lời giải
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Bài tập 15. Tính các tích phân sau:
a).
1
3
2
0
d
.
1
xx
I
xx
b).
5
2
2
3
9 1 d .
9
x
I x x
x
Lời giải
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
143
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Bài tập 16. Tính các tích phân sau:
a).
2
3
2
0
sin2 1 sin d .I x x x
b).
2
2
0
sin cos 1 cos d .I x x x x
Lời giải
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144
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 17. Tính các tích phân sau:
a).
2
0
sin2 .cos
d.
1 cos
xx
Ix
x
b).
2
4
0
1 2sin
d.
1 sin 2
x
Ix
x
Lời giải
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Bài tập 18. Tính các tích phân sau:
a).
0
2
2
sin2
d.
2 sin
x
Ix
x
b).
3
4
2
0
sin
d.
cos
x
Ix
x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
145
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Bài tập 19. Tính các tích phân sau:
a).
2
22
0
sin2
d.
cos 4sin
x
Ix
xx
b).
2
0
sin2 sin
d.
1 3cos
xx
Ix
x
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 20. Tính các tích phân sau:
a).
2
1
ln
d.
ln 2
e
x
Ix
xx
b).
2
1
ln
d.
ln 1
e
x
Ix
xx
Lời giải
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Bài tập 21. Tính các tích phân sau:
a).
1
1 3ln ln
d.
e
xx
Ix
x
b).
3
2
1
ln 2 ln
d.
e
xx
Ix
x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
147
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Bài tập 22. Tính các tích phân sau:
a).
1
sin ln
d.
e
x
Ix
x
b).
2
0
cos3
d.
sin 1
x
Ix
x
Lời giải
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Bài tập 23. Tính các tích phân sau:
a).
3
1
log
d.
e
x
Ix
x
b).
2
1
0
d.
x
I xe x
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
148
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Bài tập 24. Tính các tích phân sau:
a).
2
sin
0
cos d .
x
I e x x
b).
2
2
sin
4
sin 2 d .
x
I e x x
Lời giải
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Bài tập 25. Tính các tích phân sau:
a).
ln2
0
1d .
x
I e x
b).
ln5
2
ln2
d.
1
x
x
e
Ix
e
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
149
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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4. Câu hỏi trắc nghiệm.
Loại 1. Đổi biến hàm căn thức.
Cậu 94.(THPT Kinh Môn 2-Hải Dương) Kết quả của
4
0
1
d
21
x
x
bằng
A.
4
. B.
5
. C.
2
. D.
3
.
Lời giải
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Cậu 95.(THPT Chuyên ĐH Vinh)Tích phân
1
0
d
31
x
x
bằng
A.
4
3
. B.
3
2
. C.
1
3
. D.
2
3
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
150
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 96.(THPT Trần Hưng Đạo) Tính tích phân
e
1
1 3ln
d
x
Ix
x
bằng cách đặt
1 3lntx
,
mệnh đề nào dưới đây sai?
A.
2
3
1
2
9
It
. B.
2
1
2
d
3
I t t
. C.
2
2
1
2
d
3
I t t
. D.
14
9
I
.
Lời giải
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Cậu 97. (THPT Chuyên ĐH KHTN) Với cách đổi biến
1 3lnux
thì tích phân
1
ln
d
1 3ln
e
x
x
xx
trở thành
A.
2
2
1
2
1d
3
uu
. B.
2
2
1
2
1d
9
uu
. C.
2
2
1
2 1 duu
. D.
2
2
1
21
d
9
u
u
u
.
Lời giải
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Cậu 98.(THPT Ninh Giang) Tập hợp nghiệm của bất phương trình
2
0
d0
1
x
t
t
t
(ẩn
x
) là:
A.
;
. B.
;0
. C.
; \ 0
. D.
0;
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
151
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Cậu 99. (THPT Lê Quý Đôn-Quãng Trị) Cho biết
7
3
3
2
0
d
1
xm
x
n
x
với
m
n
là một phân số tối giản.
Tính
7mn
.
A.
0
. B.
1
. C.
2
. D.
91
.
Lời giải
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Cậu 100. (THPT Nguyễn Trãi-Đà Nẵng) Tính tích phân
5
1
d
31
x
xx
được kết quả
ln3 ln5I a b
.
Giá trị
22
3a ab b
là
A.
4
. B.
5
. C.
1
. D.
0
.
Lời giải
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Cậu 101. (THPT Hồng Bàng Hải Phòng) Cho tích phân
3
0
d
11
x
Ix
x
nếu đặt
1tx
thì
I
là
A.
2
2
1
2dI t t t
. B.
2
2
1
2 2 dI t t t
. C.
2
2
1
2 2 dI t t t
. D.
2
2
1
2dI t t t
.
Lời giải
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Cậu 102. (THPT Chuyên Nguyễn Quang Diệu) Biết
1
3 ln
d
3
e
x a b c
x
x
, trong đó
a
,
b
,
c
là các
số nguyên dương và
4c
. Tính giá trị
S a b c
.
A.
13S
. B.
28S
. C.
25S
. D.
16S
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 103.(SGD Nam Định) Biết tích phân
ln6
0
e
d ln 2 ln3
1 e 3
x
x
x a b c
, với
a
,
b
,
c
là các số
nguyên. Tính
T a b c
.
A.
1T
. B.
0T
. C.
2T
. D.
1T
.
Lời giải
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Cậu 104.(Chuyên KHTN -2018) Cho
3
0
d ln 2 ln3
3
4 2 1
xa
x b c
x
với
a
,
b
,
c
là các số
nguyên. Giá trị của
abc
bằng
A.
1
. B.
2
. C.
7
. D.
9
.
Lời giải
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Cậu 105. (Chuyên KHTN) Với cách đổi biến
1 3lnux
thì tích phân
1
ln
d
1 3ln
e
x
x
xx
trở thành
A.
2
2
1
2
1d
3
uu
. B.
2
2
1
2
1d
9
uu
. C.
2
2
1
2 1 duu
. D.
2
2
1
21
d
9
u
u
u
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
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Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Cậu 106. (Chuyên Thái Bình) Biết
1
2
0
d
54
x x a
b
x
với
a
,
b
là các số nguyên dương và phân thức
a
b
tối giản. Tính giá trị của biểu thức
22
T a b
.
A.
13T
. B.
26T
. C.
29T
. D.
34T
.
Lời giải
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Cậu 107. (TH Tuổi Trẻ) Giả sử
,,abc
là các số nguyên thỏa mãn
4
2
0
2 4 1
d
21
xx
x
x
3
42
1
1
du
2
au bu c
, trong đó
21ux
. Tính giá trị
S a b c
.
A.
3S
. B.
0S
. C.
1S
. D.
2S
.
Lời giải
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Cậu 108. (THPT NEWTON Hà Nội-2018) Cho
3
2
1
1
ln
x c d
dx a b
x
e
với c nguyên dương
và
a
,
b
,
c
,
d
,
e
là các số nguyên tố. Giá trị của biểu thức
a b c d e
bằng.
A.
14
. B.
17
. C.
10
. D.
24
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 109. (THPT Yên Định) Biến đổi
3
0
d
11
x
x
x
thành
2
1
df t t
với
1tx
. Khi đó
ft
là
hàm số nào trong các hàm số sau đây?
A.
2
22f t t t
. B.
2
f t t t
. C.
2
22f t t t
. D.
2
f t t t
.
Lời giải
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Cậu 110. (SGD Đồng Tháp) Cho
1
3 ln 3
d
3
e
x a b
x
x
với
,ab
là các số nguyên. Mệnh đề nào
dưới đây đúng ?
A.
2 12ab
. B.
24ab
. C.
10ab
. D.
10ab
.
Lời giải
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Cậu 111. (THPT Lê Qúy Đôn -2018) Cho biết
7
3
3
2
0
d
1
xm
x
n
x
với
m
n
là một phân số tối giản. Tính
7mn
A.
0
. B.
1
. C.
2
. D.
91
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
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Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Cậu 112.(THPT Chuyên KHTN) Cho
3
0
d ln 2 ln3
3
4 2 1
xa
x b c
x
với
a
,
b
,
c
là các số
nguyên. Giá trị của
abc
bằng
A.
1
. B.
2
. C.
7
. D.
9
.
Lời giải
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Cậu 113.(THPT Lê Quý Đôn-Quãng Trị) Cho
3
12
0
d
e .e .e
1
x
x
a b c
x
. Với
a
,
b
,
c
là các số
nguyên. Tính
S a b c
.
A.
1S
. B.
2S
. C.
0S
. D.
4S
.
Lời giải
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Cậu 114.(THTT) Giả sử
a
,
b
,
c
là các số nguyên thỏa mãn
4
2
0
2 4 1
d
21
xx
x
x
3
42
1
1
d
2
au bu c u
,
trong đó
21ux
. Tính giá trị
S a b c
.
A.
3S
. B.
0S
. C.
1S
. D.
2S
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 115. (THPT Lê Xoay-Vĩnh Phúc) Cho tích phân
4
0
d2
ln
3
3 2 1
x
I a b
x
với
,ab
.
Mệnh đề nào sau đây đúng?
A.
3ab
. B.
5ab
. C.
5ab
. D.
3ab
.
Lời giải
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Cậu 116. (THPT Sơn Tây-2018) Biết
3
2
1
d1
3 2 ln 3 2 3
2
11
x
a b c
xx
với
a
,
b
,
c
là
các số hữu tỷ. Tính
P a b c
.
A.
1
2
P
. B.
1P
.
C.
1
2
P
. D.
5
2
P
.
Lời giải
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Cậu 117.(THPT Quãng Xương) Giả sử
2
2
4
1
11
d
xb
x a a b
x c b c
với
,,abc
;
1 , , 9abc
. Tính giá trị của biểu thức
2
ba
ac
C
.
A.
165
. B.
715
. C.
5456
. D.
35
.
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
157
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
Lời giải
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Cậu 118. (THPT Phan Châu Trinh)Biết
2
1
d
11
x
abc
x x x x
với
a
,
b
,
c
là các số
nguyên dương. Tính
P a b c
.
A.
44P
. B.
42P
. C.
46P
. D.
48P
.
Lời giải
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Cậu 119.(SGD Bắc Ninh) Biết
2
3
33
2 8 11
1
1 1 1
2d
a
x x c
x x x b
, với
,,abc
nguyên dương,
a
b
tối
giản và
ca
. Tính
S a b c
A.
51S
. B.
67S
. C.
39S
. D.
75S
.
Lời giải
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 120.(THTT Số 2-485 tháng 11) Cho
2
1
d2f x x
. Tính
4
1
d
fx
Ix
x
bằng
A.
1I
. B.
2I
. C.
4I
. D.
1
2
I
.
Lời giải
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Cậu 121.(Đề Chính Thức 2018 ) Cho với là các số hữu tỉ.
Mệnh đề nào dưới đây đúng?
A. . B. . C. . D. .
Lời giải
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Cậu 122.(THPT Chuyên Trần Phú) Biết với , , là các số
hữu tỷ, tính .
A. . B. . C. . D. .
Lời giải
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21
5
d
ln3 ln5 ln7
4
x
a b c
xx
,,abc
2a b c
a b c
a b c
2a b c
2
2
1
d 2 35
3 9 1
x
x a b c
xx
a
b
c
27P a b c
1
9
86
27
2
67
27
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
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Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Cậu 123.Tìm tất cả các giá trị dương của tham số
m
sao cho
22
1 500 1
0
e d 2 .e
m
xm
xx
.
A.
250 500
2 2 2m
. B.
1000
21m
. C.
250 500
2 2 2m
. D. .
Lời giải
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Loại 2. Đổi biến hàm lượng giác.
Cậu 124. (THPT Hồng Quang-Hải Dương) Tính tích phân
2
4
0
cos sin dI x x x
bằng cách đặt
costx
, mệnh đề nào dưới đây đúng ?
A.
1
4
0
dI t t
. B.
1
4
0
dI t t
. C.
2
4
0
dI t t
. D.
2
3
0
dI t t
.
Lời giải
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Cậu 125. (THPT Lê Quý Đôn-Hà Nội) Tính tích phân
π
3
3
0
sin
d
cos
x
Ix
x
.
A.
5
2
I
. B.
3
2
I
. C.
π9
3 20
I
. D.
9
4
I
.
Lời giải
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1000
21m
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
160
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 126.(THPT Chuyên Lê Quý Đôn) Tìm khẳng định đúng trong các khẳng định sau
A.
11
00
sin 1 d sin dx x x x
. B.
11
00
cos 1 d cos dx x x x
.
C.
2
00
cos d cos d
2
x
x x x
. D.
2
00
sin d sin d
2
x
x x x
.
Lời giải
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Cậu 127.(ĐHQG TPHCM) Cho hàm số liên tục trên thỏa điều kiện .
Tính
A. . B. . C. . D. .
Lời giải
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Cậu 128.(THPT Đặng Thúc Hứa) Cho và . Tính
3
0
df x x
.
A. . B. . C. . D. .
Lời giải
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fx
2sinf x f x x
2
2
df x x
1
0
1
2
1
0
2 1 d 12f x x
2
2
0
sin sin 2 d 3f x x x
26
22
27
15
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
161
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Cậu 129.(SGD Đồng Tháp) Tính tích phân bằng cách đặt , mệnh đề nào
dưới đây đúng?
A. . B. . C. . D. .
Lời giải
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Cậu 130.(Toán học Tuổi Trẻ) Cho tích phân , trong đó là các hằng
số hữu tỉ. Tính .
A. . B. . C. . D. .
Lời giải
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Cậu 131.(THTT Số 3-486) Cho hàm số liên tục trên thỏa mãn , .
Tính .
A. . B. . C. . D. .
Lời giải
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2
4
4
0
sin
d
cos
x
Ix
x
tanux
4
2
0
dI u u
2
2
0
1
dIu
u
1
2
0
dI u u
1
2
0
dI u u
0
3
cos2 cos4 d 3x x x a b
,ab
2
log
a
eb
2
3
1
8
0
fx
4
tan cosf x x
x
1
0
dI f x x
2
8
1
2
4
4
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Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Cậu 132.(THPT Kinh Môn-Hải Dương) Cho tính
S a b c
.
A. . B. . C. . D. .
Lời giải
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Cậu 133. (Chuyên KHTN-2018) Có bao nhiêu giá trị của tham số trong khoảng thỏa
mãn ?
A. B. . C. . D. .
Lời giải
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2
2
0
cos 4
d ln ,
sin 5sin 6
x
x a b
x x c
1S
4S
3S
0S
m
0;6
0
sin 1
d
5 4cos 2
m
x
x
x
6
12
8
4
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Cậu 134.(Trần Kỳ Phong) Cho
fx
liên tục trên thỏa
9
1
()
d4
fx
x
x
và
2
0
(sin )cos 2f x xdx
. Tính
3
0
( )dI f x x
.
A.
10I
. B.
6I
. C.
4I
. D.
2I
.
Lời giải
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Cậu 135.(Sở GD-ĐT Phú Thọ-2018) Cho , trong
đó , , , là phân số tối giản. Tính .
A. . B. . C. . D. .
Lời giải
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2
0
4cos2 3sin2 ln cos 2sin d ln2
a
x x x x x c
b
a
b
*
c
a
b
T a b c
9T
11T
5T
7T
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Câu 136.(Sở GD ĐT Cần Thơ) Nguyên hàm
Fx
của hàm số
23
sin 2 .cos 2f x x x
thỏa
0
4
F
A.
35
1 1 1
sin 2 sin 2
6 10 15
F x x x
. B.
35
1 1 1
sin 2 sin 2
6 10 15
F x x x
.
C.
35
1 1 1
sin 2 sin 2
6 10 15
F x x x
. D.
35
1 1 4
sin 2 sin 2
6 10 15
F x x x
.
Lời giải
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Câu 137. (Sở GD-ĐT Thanh Hóa) Cho hàm số liên tục trên và thỏa mãn
. Tính tích phân .
` A.
3I
. B.
3
2
I
. C.
2I
. D.
5
2
I
.
Lời giải
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fx
16
2
2
1
4
cot . sin d d 1
fx
x f x x x
x
1
1
8
4
d
fx
x
x
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Câu 138. (Sở GD-ĐT Thanh Hóa) Cho với , , là các số
hữu tỉ. Tính .
A. . B. . C. . D. .
Lời giải
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Câu 139. (THPT Hồng Lĩnh Hà Tỉnh) Cho hàm số liên tục trên thỏa mãn
và . Tính tích phân .
A. . B. . C. . D. .
Lời giải
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Câu 140. (Chuyên Thoại Ngọc Hầu) Cho là hàm số liên tục thỏa .
Tính .
A. . B. . C. . D. .
Lời giải
4
0
sin2 ln tan 1 dx x x
ln2a b c
a
b
c
11
Tc
ab
2T
4T
6T
4T
fx
16
1
16
d6
fx
x
x
2
0
sin cos d 3f x x x
4
0
dI f x x
2I
6I
9I
2I
f
1
0
d7f x x
2
0
cos . sin dI x f x x
1
9
3
7
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Câu 141. (Chuyên Hạ Long-2018) Giá trị gần bằng số nào nhất trong
các số sau đây:
A. . B. . C. . D. .
Lời giải
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Loại 4. Đổi biến một số tích phân đặc biệt.
Câu 142.(Cụm 5 Chuyên Đồng Bằng Sông cửu Long) Cho hàm số
y f x
liên tục trên
,ab
. Giả sử hàm số
u u x
có đạo hàm liên tục trên
,ab
và
,ux
,x a b
, hơn
nữa
fu
liên tục trên đoạn
,
. Mệnh đề nào sau đây là đúng?
xa
A.
dd
bb
aa
f u x u x x f u u
. B.
dd
ub
b
u a a
f u x u x x f u u
.
C.
dd
ub
b
a u a
f u x u x x f u u
. D.
dd
bb
aa
f u x u x x f x u
.
Lời giải
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Câu 143.(THPT Chuyên ĐHSP –Hà Nội) Cho số dương
a
và hàm số
fx
liên tục trên thỏa
mãn
f x f x a
,
x
. Giá trị của biểu thức
d
a
a
f x x
bằng
A.
2
2a
. B.
a
. C.
2
a
. D.
2a
.
Lời giải
3
3
3
9
4
cos
23
1
6
sin e d
x
I x x x
0,046
0,036
0,037
0,038
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Câu 144.(Sở GD & ĐT Cần Thơ) Giả sử hàm số
y f x
liên tục trên và
5
3
df x x a
,
a
.
Tích phân
2
1
2 1 dI f x x
có giá trị là
A.
1
1
2
Ia
. B.
21Ia
. C.
2Ia
. D.
1
2
Ia
.
Lời giải
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Câu 145.(THPT Chuyên Hùng Vương) Cho
4
0
d 16f x x
. Tính
2
0
2df x x
A.
16
. B.
4
. C.
32
. D.
8
.
Lời giải
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Câu 146.(THPT Chuyên Lam Sơn) Cho hàm số
fx
liên tục trên và thỏa mãn
1
5
d9f x x
.
Tính tích phân
2
0
1 3 9 df x x
.
A.
27
. B.
21
. C.
15
. D.
75
.
Lời giải
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Câu 147.(THPT Chuyên Tiền Giang) Cho hàm số
y f x
liên tục trên . Biết
2
2
0
. d 2x f x x
,
hãy tính
4
0
dI f x x
A.
2I
. B.
1I
. C.
1
2
I
. D.
4I
.
Lời giải
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Câu 148.Biết
11
1
d 18f x x
. Tính
2
2
0
2 3 1 dI x f x x
.
A.
5I
. B.
7I
. C.
8I
D.
10I
.
Lời giải
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Câu 149.(THPT Chuyên Lương Thế Vinh) Cho hàm số
y f x
liên tục trên và
1
0
2 d 8f x x
.
Tính
2
2
0
dI xf x x
A.
4
. B.
16
. C.
8
. D.
32
.
Lời giải
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Câu 150.(THPT Trần Nhân Tông) Cho . Tính .
A. . B. . C. . D. .
Lời giải
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6
0
d 12f x x
2
0
3dI f x x
6I
36I
2I
4I
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Câu 151.(SGD Nam Định) Biết
4
e
e
1
ln d 4f x x
x
. Tính tích phân
4
1
dI f x x
.
A.
8I
. B.
16I
. C.
2I
. D.
4I
.
Lời giải
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Câu 152.(Chuyên Phan Bội Châu-2018) Cho . Khi đó bằng
A. . B. . C. . D. .
Lời giải
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Câu 153. (Chuyên Lam Sơn Thanh Hóa) Cho hàm số liên tục trên và thỏa mãn
. Tính tích phân .
A. . B. . C. . D. .
Lời giải
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Câu 154. (SGD Đồng Tháp) Cho biết . Tính tích phân .
A. . B. . C. . D. .
Lời giải
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Câu 155. (THPT Chuyên Lê Quý Đôn) Cho hàm số liên tục trên thỏa . Khi
đó tích phân bằng
A. . B. . C. . D. .
Lời giải
2
2
1
1 d 2f x x x
5
2
dI f x x
2
1
1
4
fx
1
5
d9f x x
2
0
1 3 9 df x x
27
21
15
75
3
1
d8f x x
12
4
d
4
x
I f x
12I
2I
32I
3I
fx
2018
0
d2f x x
2018
e1
2
2
0
ln 1 d
1
x
f x x
x
4
1
2
3
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Câu 156.(Chuyên Biên Hòa - Hà Nam) Cho hàm số liên tục và có đạo hàm trên thỏa
mãn ; . Tính tích phân .
A . . B. . C. . D. .
Lời giải
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Câu 157.(THPT Trần Phú Hà Tĩnh) Biết . Tính .
A. . B. . C. D. .
Lời giải
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Câu 158.(THPT Chuyên Thái Bình) Cho hàm số
4 3 2
4 2 1f x x x x x
,
x
.
Tính
1
2
0
.df x f x x
.
A.
2
3
. B.
2
. C.
2
3
. D.
2
.
Lời giải
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Câu 159.(THPT Chuyên Vĩnh Phúc)Cho hàm số
4 3 2
4 3 1f x x x x x
,
x
.
Tính
1
2
0
.dI f x f x x
.
A.
2
. B.
2
. C.
7
3
. D.
7
3
.
Lời giải
y f x
22f
2
0
d1f x x
4
0
dI f x x
10I
5I
0I
18I
11
1
d 18f x x
2
2
0
2 3 1 dI x f x x
5I
7I
8I
10I
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Câu 160.(THPT Chuyên Lê Quý Đôn) Cho hàm số liên tục và nhận giá trị dương trên .
Biết với . Tính giá trí
A. . B. . C. . D. .
Lời giải
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Câu 161.(THPT Chuyên Biên Hòa) Cho hàm số liên tục và có đạo hàm trên thỏa mãn
; . Tính tích phân .
A . . B. . C. . D. .
Lời giải
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Câu 162.(THPT Chuyên Hùng Vương) Giả sử
2 3 d
1
1 2 3 1
xx
C
x x x x g x
(
C
là hằng số).
Tính tổng các nghiệm của phương trình
0gx
.
A.
1
. B.
1
. C.
3
. D.
3
.
Lời giải
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fx
0;1
. 1 1f x f x
0;1x
1
0
d
1
x
I
fx
3
2
1
2
1
2
y f x
22f
2
0
d1f x x
4
0
dI f x x
10I
5I
0I
18I
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Câu 163.(Sở GD ĐT Cần Thơ) Cho
6 8 7
2 3 2 d 3 2 3 2x x x A x B x C
với
A
,
B
và
C
. Giá trị của biểu thức
12 7AB
bằng
A.
23
252
. B.
241
252
. C.
52
9
. D.
7
9
.
Lời giải
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Câu 164.(THPT Trần Phú –Đà Nẵng) Biết
2
1
0
5 6 e
e
d e ln
2 e 3
x
x
xx
ac
x a b
x
với
a
,
b
,
c
là các
số nguyên và
e
là cơ số của logarit tự nhiên. Tính
2S a b c
.
A.
10S
. B.
0S
. C.
5S
. D.
9S
.
Lời giải
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Câu 165.(Tạp chí THTT) Giá trị của tích phân
100
0
1 ... 100 dx x x x
bằng
A.
0
. B.
1
. C.
100
. D. một giá trị khác.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
173
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Câu 166.(Sở GD và ĐT Hà Nam-2018) Biết
2
2
1
31
ln
d ln
3 ln
x
b
xa
x x x c
với
a
,
b
,
c
là các số
nguyên dương và
4c
. Tổng
abc
bằng
A.
6
. B.
9
. C.
7
. D.
8
.
Lời giải
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Câu 167.(Sở GD & ĐT Cần Thơ) Biết
e
1
ln 3
d ln , ,
ln 2 2
x
I x a b a b Q
xx
. Mệnh đề nào sau
đây đúng?
A.
1ab
. B.
21ab
. C.
22
4ab
. D.
20ab
.
Lời giải
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Câu 168.(Sở GD-ĐT Bình Thuận-2018) Tính tích phân
2018
0
4
ln 1 2
d
1 2 log e
x
x
Ix
.
A.
2018
ln 1 2 ln2I
. B.
2 2018 2
ln 1 2 ln 2I
.
C.
2 2018
ln 1 2 ln4I
. D.
2 2018 2
ln 1 2 ln 2I
.
Lời giải
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Câu 169.(Chuyên Hùng Vương-2018) Cho
e
2
1
ln
d
ln 2
x
Ix
xx
có kết quả dạng
lnI a b
với
0a
,
b
. Khẳng định nào sau đây đúng?
A.
21ab
. B.
21ab
. C.
31
ln
23
b
a
. D.
31
ln
23
b
a
.
Lời giải
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
174
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 170.(THTT số 5-488) Tìm tất cả các giá trị dương của
m
để
3
0
10
3
9
m
x x dx f
, với
15
lnf x x
.
A.
20m
. B.
4m
. C.
5m
. D.
3m
.
Lời giải
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Câu 171.(THPT Chuyên Thái Bình) Cho
2
1
0
e
d .e ln e
e
x
x
xx
x a b c
x
với
a
,
b
,
c
.
Tính
2P a b c
.
A.
1P
. B.
1P
. C.
0P
. D.
2P
.
Lời giải
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Câu 172.(THPT Chuyên Hà Tĩnh) Biết
1
2
2
0
2 3 3
d ln
21
xx
x a b
xx
với
a
,
b
là các số nguyên dương.
Tính
22
P a b
.
A.
13
. B.
5
. C.
4
. D.
10
.
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
175
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
Lời giải
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Câu 173.(THPT Chuyên Hạ Long) Biết
2
2
1
1
d ln ln
ln
x
x a b
x x x
với
a
,
b
là các số nguyên
dương. Tính
22
P a b ab
.
A.
10
. B.
8
. C.
12
. D.
6
.
Lời giải
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Câu 174.(THPT Chuyên ĐH Vinh) Cho
fx
liên tục trên và thỏa mãn
2 16f
,
1
0
2 d 2f x x
. Tích phân
2
0
dxf x x
bằng
A.
30
. B.
28
. C.
36
. D.
16
.
Lời giải
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Câu 175.(ĐHQG TPHCM) Cho hàm số
fx
liên tục trên thỏa
1
0
2 d 2f x x
và
2
0
6 d 14f x x
. Tính
2
2
5 2 df x x
.
A.
30
. B.
32
. C.
34
. D.
36
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
176
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
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Câu 176.(Sở GD-ĐT Sóc Trăng-2018) Cho hàm số
y f x
liên tục trên đoạn
1;3
thỏa mãn
4 , 1;3f x f x x
và
3
1
d2xf x x
. Giá trị
3
1
df x x
bằng
A.
2
. B.
1
. C.
2
. D.
1
.
Lời giải
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Câu 177.(Sở GD-ĐT Gia Lai-2018) Tính
2
2
2
d
b
a
ax
Ix
ax
(với
a
,
b
là các số thực dương).
A.
22
2b
I
ab
. B.
2
b
I
ab
. C.
2
11
1
ab
I
a b a
. D.
2
b
I
ab
.
Lời giải
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Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
177
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Câu 178.Cho hàm số
y f x
liên tục trên
0;4
và
2
0
d1f x x
;
;
4
0
d3f x x
.
Tính
1
1
3 1 df x x
A.
4
. B.
2
. C.
4
3
. D.
1
.
Lời giải
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Câu 179.Cho hàm
fx
liên tục trên thỏa mãn
4
0
tan d 3f x x
và
2
1
2
0
d1
1
x f x
x
x
.
Tính
1
0
df x x
.
A.
4
. B.
2
. C.
5
. D.
1
.
Lời giải
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Câu 180.Cho
2
2
0
ed
x
t
F x t
. Tính
2F
.
A.
4
2 4eF
. B.
16
2 8eF
. C.
16
2 4eF
. D.
4
2eF
.
Lời giải
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Câu 181.(Chuyên Vĩnh Phúc-2018) Cho
fx
và
gx
là hai hàm số liên tục trên .
Biết
5
1
2 3 d 16f x g x x
và
5
1
3 d 1f x g x x
. Tính
2
1
2 1 df x x
.
A.
1
. B.
5
2
. C.
1
2
. D.
5
.
Trung Tâm Luyện Thi Đại Học Amsterdam Chương III-Bài 3. Tích Phân
178
Lớp Toán Thầy – Diệp Tuân Tel: 0935.660.880
Lời giải
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Câu 182.(THPT Can Lộc-Hà Tỉnh) Cho hàm số
y f x
có đạo hàm, liên tục trên và
0fx
khi
0;5x
. Biết
. 5 1f x f x
, tính tích phân
5
0
d
1
x
I
fx
.
A.
5
4
I
. B.
5
3
I
. C.
5
2
I
. D.
10I
.
Lời giải
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Câu 183.(Chuyên Hạ Long-2018) Biết
2
2
1
1
d ln ln
ln
x
x a b
x x x
với
a
,
b
là các số nguyên
dương. Tính
22
P a b ab
.
A.
10
. B.
8
. C.
12
. D.
6
.
Lời giải
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Câu 184.(Chuyên Đại Học Vinh) Cho liên tục trên và thỏa mãn , .
Tích phân bằng ?
A. . B. . C. . D. .
Lời giải
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fx
2 16f
1
0
2 d 2f x x
2
0
dxf x x
30
28
36
16
Trung Tâm Luyện Thi Đại Học Amsterdam
Chương III-Bài 3. Tích Phân
179
Lớp Toán Thầy –Diệp Tuân Tel: 0935.660.880
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Câu 185.(Chuyên Hà Tỉnh) Cho
2
1
0
e
d .e ln e
e
x
x
xx
x a b c
x
với
a
,
b
,
c
.
Tính
2P a b c
.
A.
1P
. B.
1P
. C.
0P
. D.
2P
.
Lời giải
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-Bài 3. Tích Phân
180
Tel: 0935.660.880
. .
1. .
u
và
v
;ab
;ab
.dd
b
bb
aa
a
u v uv v u
:
u
''
log, nhì , tam
''
.
2. .
Bài toán 1.
ln df x g x x
ln
dd
u g x
v f x x
.
Bài tp 26. Tính các tích phân sau:
a).
2
3
1
ln
d.
x
Ix
x
b).
2
2
1
log
d.
e
x
Ix
x
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Bài tp 27. Tính các tích phân sau:
a).
5
1
ln d .
e
I x x x
b).
32
1
ln d .
e
I x x x
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-Bài 3. Tích Phân
181
Tel: 0935.660.880
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Bài tp 28. Tính các tích phân sau:
a).
3
2
2
ln d .I x x x
b).
1
0
2 1 ln 1 d .I x x x
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Bài tp 29. Tính các tích phân sau:
a).
3
0
sin .ln cos d .I x x x
b).
3
2
6
ln sin
d.
cos
x
Ix
x
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-Bài 3. Tích Phân
182
Tel: 0935.660.880
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Bài toán 2.
sin
cos d
ax
ax
f x ax x
e
sin
d cos d
ax
u f x
ax
v ax x
e
.
Bài tp 30. Tính các tích phân sau:
a).
2
0
cos d .I x x x
b).
2
3
0
sin d .I x x x
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-Bài 3. Tích Phân
183
Tel: 0935.660.880
Bài tp 31. Tính các tích phân sau:
a).
4
0
1 sin 2 d .I x x x
b).
3
2
4
tan d .I x x x
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Bài tp 32. Tính các tích phân sau:
a).
1
0
1 d .
x
I x e x
b).
1
2
2
0
d.
2
x
xe
Ix
x
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-Bài 3. Tích Phân
184
Tel: 0935.660.880
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Bài tp 33. Tính các tích phân sau:
a).
2
1
3
0
d.
x
I x e x
b).
2
2
3
0
1 2 d .
xx
I x e x
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Bài toán 3.
sin
d
cos
ax
ax
ex
ax
sin
cos
dd
ax
ax
u
ax
v e x
.
Bài tp 34. Tính các tích phân sau:
a).
2
0
sin d .
x
I e x x
b).
2
sin
0
sin 2 d
x
I e x x
.
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-Bài 3. Tích Phân
185
Tel: 0935.660.880
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Bài tp 35. Tính các tích phân sau:
a).
22
0
sin d .
x
I e x x
b).
1
cos ln d .
e
I x x
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-Bài 3. Tích Phân
186
Tel: 0935.660.880
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C
Bài 34. Tính các tích phân sau:
a).
6
2
2
0
3 d .I x x
b).
2
22
1
4 d .I x x x
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Bài 35. Tính các tích phân sau:
a).
2
2
2
2
0
d.
1
x
Ix
x
b).
1
2
2
2
2
1
d.
x
Ix
x
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Bài 36. Tính các tích phân sau:
a).
12
2
1
1
d.
23
Ix
xx
b).
1
2
2
0
d
.
13
x
I
x
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-Bài 3. Tích Phân
187
Tel: 0935.660.880
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Bài 37. Tính các tích phân sau:
a).
5
2
2 3 1
1
d.
1 2 8
Ix
x x x
b).
3
2
3
1
23
d.
1
xx
Ix
x
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Bài 38. Tính các tích phân sau:
a).
1
3
34
0
1 d .I x x x
b).
2007
1
2
1
2
11
1 d .Ix
xx
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-Bài 3. Tích Phân
188
Tel: 0935.660.880
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Bài 39. Tính các tích phân sau:
a).
1
32
0
3d .I x x x
b).
1
83
0
1 d .I x x x
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Bài 40. Tính các tích phân sau:
a).
7
3
3
0
1
d.
31
x
Ix
x
b).
7
3
3
2
0
d
.
1
xx
I
x
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Bài 41. Tính các tích phân sau:
a).
1
2
0
d.
11
x
Ix
xx
b).
3
2
2
1
d.
16
Ix
xx
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-Bài 3. Tích Phân
189
Tel: 0935.660.880
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Bài 42. Tính các tích phân sau:
a).
3
1
3
d.
3 1 3
x
Ix
xx
b).
2
2
1
1
d.
1
x
Ix
xx
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Bài 43. Tính các tích phân sau:
a).
2
0
sin2
d.
1 cos
x
Ix
x
b).
2
0
cos sin cos
d.
2 sin
x x x
Ix
x
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-Bài 3. Tích Phân
190
Tel: 0935.660.880
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Bài 44. Tính các tích phân sau:
a).
2
0
sin2 sin
d.
1 3cos
xx
Ix
x
b).
3
35
4
4
d
.
sin cos
x
I
xx
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-Bài 3. Tích Phân
191
Tel: 0935.660.880
Bài 45. Tính các tích phân sau:
a).
1
1 ln
d.
e
x
Ix
x
b).
2
1
lg
d.
1 3ln
e
x
Ix
xx
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Bài 46. Tính các tích phân sau:
a).
4
1
ln 1
d.
x
Ix
xx
b).
2
2
sin2
0
cos2 d .
xx
I x x e x
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-Bài 3. Tích Phân
192
Tel: 0935.660.880
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Bài 47. Tính các tích phân sau:
a).
tan 2
4
2
0
d.
cos
x
e
Ix
x
b).
ln10
ln4
d.
21
x
xx
e
Ix
ee
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Bài 48. Tính các tích phân sau:
a).
1
0
ln 1 d .I x x
b).
3
2
1
3 ln
d.
1
x
Ix
x
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-Bài 3. Tích Phân
193
Tel: 0935.660.880
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Bài 49. Tính các tích phân sau:
a).
3
2
1
1 ln 1
d.
x
Ix
x
b).
2
1
ln d .
e
I x x x
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Bài 50. Tính các tích phân sau:
a).
2
0
1 sin d .I x x x
b).
2
3
4
cos
d.
sin
xx
Ix
x
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-Bài 3. Tích Phân
194
Tel: 0935.660.880
Bài 51. Tính các tích phân sau:
a).
2
0
cos sin d .I x x x x
b).
3
2
0
sin
d.
cos
xx
Ix
x
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Bài 52. Tính các tích phân sau:
a).
1
2
0
2 1 d .
x
I x x e x
b).
2
3
0
sin5 d .
x
I e x x
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4. .
.
Câu 186.(THPT Chuyên Thái Bình) Cho
e
1
ln dI x x x
2
.eab
c
a
,
b
,
c
.
Tính
T a b c
.
A.
5
. B.
3
. C.
4
. D.
6
.
-Bài 3. Tích Phân
195
Tel: 0935.660.880
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Câu 187.(THPT Bình Xuyên-2018) Tính
e
2
1
ln dx x x
A.
3
2e 1
9
. B.
3
2e 1
9
. C.
3
e2
9
. D.
3
e2
9
.
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Câu 188. (SGD Tháp) Tính tích phân
1
0
2 1 d
x
I x e x
21ux
,
dd
x
v e x
.
A.
1
1
0
0
2 1 2 d
xx
I x e e x
. B.
1
1
2
0
0
2 1 d
xx
I x e e x
.
C.
1
1
2
0
0
2 1 d
xx
I x e e x
. D.
1
1
0
0
2 1 2 d
xx
I x e e x
.
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. .
Câu 189.
2 2 2
d , .
x x x
xe x axe be C a b
Tính tích
ab
.
A.
1
4
ab
. B.
1
4
ab
. C.
1
8
ab
. D.
1
8
ab
.
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-Bài 3. Tích Phân
196
Tel: 0935.660.880
Câu 190. (THTT 2-485)
fx
1;e
e
1
d1
fx
x
x
,
e1f
e
1
.ln dI f x x x
A.
4I
. B.
3I
. C.
1I
. D.
0I
.
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Câu 191.(THPT Quang- Tính
2
1
ed
x
I x x
.
A.
2
eI
. B.
2
eI
. C.
2
3e 2eI
. D.
eI
.
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Câu 192.(THPT Ninh Giang-
ln 2f x x x
.
A.
22
4
d ln 2
24
x x x
f x x x C
. B.
22
44
d ln 2
24
x x x
f x x x C
.
C.
22
4
d ln 2
22
x x x
f x x x C
. D.
22
44
d ln 2
22
x x x
f x x x C
.
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Câu 193.(THPT Cho
()Fx
5 1 e
x
f x x
và
03F
. Tính
1F
.
A.
1 11e 3F
. B.
1 e 3F
. C.
1 e 7F
. D.
1 e 2F
.
-Bài 3. Tích Phân
197
Tel: 0935.660.880
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Câu 194.(THPT - Tính tích phân
5
4
1 ln 3 dI x x x
?
A.
10ln2
. B.
19
10ln2
4
. C.
19
10ln2
4
. D.
19
10ln2
4
.
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Câu 195.(THPT -Quãng Ngãi)
3
2
ln d ln3 ln2x x x m n p
m
,
n
,
p
m
là
A.
9
2
. B.
18
. C.
9
. D.
27
4
.
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Câu 196.- Nguyên
1 ln
.ln
x
fx
xx
là
A.
1 ln
d ln ln
.ln
x
x x C
xx
. B.
2
1 ln
d ln .ln
.ln
x
x x x C
xx
.
C.
1 ln
d ln ln
.ln
x
x x x C
xx
. D.
1 ln
d ln .ln
.ln
x
x x x C
xx
.
-Bài 3. Tích Phân
198
Tel: 0935.660.880
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Câu 197.(THPT Phan Châu Trinh-DakLak) Tính tích phân
e
1
ln d .I x x x
A.
1
2
I
. B.
2
e2
2
I
. C.
2
e1
4
I
. D.
2
e1
4
I
.
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Câu 198.)
2
0
2 ln 1 d .lnx x x a b
*
,ab
,
b
Tính
67ab
.
A.
33
. B.
25
. C.
42
. D.
39
.
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Câu 199.(THPT Can -Hà
2
ed
x
xx
2
1
e
4
x
ax b C
,ab
và
C
là
A.
20ab
. B.
ba
. C.
ab
. D.
20ab
.
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-Bài 3. Tích Phân
199
Tel: 0935.660.880
Câu 200.(THPT Chuyên Thái Bình) Cho
y f x
0;5
và
5 10f
,
5
0
d 30xf x x
. Tính
5
0
df x x
.
A.
20
. B.
30
. C.
20
. D.
70
.
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Câu 201.(SGD Hà - 11) Tích phân
100
2
0
.e d
x
xx
A.
200
1
199e 1
4
. B.
200
1
199e 1
2
. C.
200
1
199e 1
4
.D.
200
1
199e 1
2
.
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Câu 202.-Giang)
2
1
ln 1 d ln3 ln2x x a b c
a
,
b
,
c
nguyên. Tính
S a b c
A.
0S
. B.
1S
. C.
2S
. D.
2S
.
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Câu 203.(THPT Trãi- Tính
π
0
sin dJ x x x
.
A.
π
. B.
π
. C.
π
4
. D.
π
2
.
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-Bài 3. Tích Phân
200
Tel: 0935.660.880
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Câu 204.(THPT Chuyên Phú) Tích phân
2
0
3 2 cos dx x x
A.
2
3
4
. B.
2
3
4
. C.
2
1
4
. D.
2
1
4
.
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Câu 205.
2
1
4 1 ln d ln2x x x a b
a
,
bZ
2ab
A.
5.
B.
8.
C.
1; 2;1A
D.
13.
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Câu 206.(THPT Thành 2)
3
2
1
3 ln ln ln
d
4
1
x a b c
x
x
a
,
b
,
c
P a b c
A.
46
. B.
35
. C.
11
. D.
48
.
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-Bài 3. Tích Phân
201
Tel: 0935.660.880
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Câu 207.(SGD Nam )
cos2 d sin 2 cos2x x x ax x b x C
a
,
b
Tính tích
ab
?
A.
1
8
ab
. B.
1
4
ab
. C.
1
8
ab
. D.
1
4
ab
.
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Câu 208.(THPT Thúc Tính tích phân
2
0
cos dI x x x
.
A.
1
2
. B.
1
2
. C.
1
. D.
2
.
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Câu 209. Cho
1ab
. Tích phân
ln 1 d
b
a
I x x
A.
1 ln 1
b
a
I x x a b
. B.
1 ln 1
b
a
I x x b a
.
C.
1
1
b
a
I
x
. D.
ln 1 d
1
b
b
a
a
x
I x x x
x
.
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Câu 300.
e
1
2 5 ln dx x x
A.
e
e
2
1
1
5 ln 5 dI x x x x x
. B.
e
e
2
1
1
5 ln 5 dI x x x x x
.
C.
e
e
2
1
1
5 ln 5 dI x x x x x
. D.
e
e
2
1
1
5 ln 5 dI x x x x x
.
-Bài 3. Tích Phân
202
Tel: 0935.660.880
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Câu 301. GD- -2018) Tính tích phân
2
2018
2
1
1
2019log d
ln2
I x x x
.
A.
2017
2I
. B.
2019
2I
. C.
2018
2I
. D.
2020
2I
.
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Câu 302.-
y f x
1;2
và
2
1
1dx f x x a
. Tính
2
1
df x x
theo
a
và
2bf
.
A.
ba
. B.
ab
. C.
ab
. D.
ab
.
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Câu 303. GD-
3
2
1
3 ln
d
1
x
Ix
x
1 ln3 ln2ab
,
,ab
.
22
ab
A.
22
7
16
ab
. B.
22
16
9
ab
. C.
22
25
16
ab
. D.
22
3
4
ab
.
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-Bài 3. Tích Phân
203
Tel: 0935.660.880
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Câu 304. )
y f x
2
0
sin . d 0x f x x f
1
.
Tính
2
0
cos . dI x f x x
.
A.
1I
. B.
0I
. C.
2I
. D.
1I
.
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Câu 305.) Tích phân
2
2
0
.e d
x
I x x
là
A.
4
3e 1
4
I
. B.
4
e
4
I
. C.
4
1 3e
4
I
. D.
4
3e 1
4
I
.
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Câu 306. GD- -2018) Tích phân
100
2
0
.e d
x
xx
A.
200
1
199e 1
4
. B.
200
1
199e 1
2
. C.
200
1
199e 1
4
.D.
200
1
199e 1
2
.
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-Bài 3. Tích Phân
204
Tel: 0935.660.880
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Câu 307.(THPT Phan Chu Trinh) Tính tích phân
e
1
ln d .I x x x
A.
1
2
I
. B.
2
e2
2
I
. C.
2
e1
4
I
. D.
2
e1
4
I
.
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Câu 308.(THPT Phú-Hà
2
1
4 1 ln d ln2x x x a b
a
,
bZ
.
2ab
A.
5.
B.
8.
C.
1; 2;1A
D.
13.
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. .
Câu 309.
1
ln
d
e
x
x a e b
x
,ab
. Tính
.P a b
.
A.
4P
. B.
8P
. C.
4P
. D.
8P
.
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Câu 310.-
3
3
2
ln 3 2 d ln5 ln2x x x a b c
,,a b c
.
Tính
.S a b c
A.
60S
. B.
23S
. C.
12S
. D.
2S
.
-Bài 3. Tích Phân
205
Tel: 0935.660.880
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Câu 311.(THPT Chuyên Lê Quý
a
,
b
khác không.
3
e
1
x
a
f x bx
x
x
khác
1
0 22f
và
1
0
d5f x x
. Tính
ab
?
A.
19
. B.
7
. C.
8
. D.
10
.
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Câu 312.(THPT Kinh Môn 2-
fx
và
2 16f
,
2
0
d4f x x
. Tính tích phân
1
0
. 2 dI x f x x
.
A.
13I
. B.
12I
. C.
20I
. D.
7I
.
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-Bài 3. Tích Phân
206
Tel: 0935.660.880
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Câu 313. (THPT Thanh 1-
1
0
7
2 ln 1 d ln 2I x x x a
b
a
,
b
A.
ab
. B.
ab
. C.
ab
. D.
3ab
.
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Câu 314.(THTT 5-488)
n
1
22
0
1d
n
n
I x x x
.
Tính
1
lim
n
n
n
I
I
.
A.
1
. B.
2
. C.
3
. D.
5
.
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-Bài 3. Tích Phân
207
Tel: 0935.660.880
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Câu 315. (THPT Lê Quý -Quãng
y f x
2
0
sin . d 0x f x x f
1
. Tính
2
0
cos . dI x f x x
.
A.
1I
. B.
0I
. C.
2I
. D.
2
.
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Câu 316.(PTNK- TP HCM) Cho hàm
2
2 khi 0
.s ki in h 0
x x x
fx
x xx
.
Tích tích phân
1
dI f x x
A.
7
6
I
. B.
2
3
I
. C.
1
3
3
I
. D.
2
2
5
I
.
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-Bài 3. Tích Phân
208
Tel: 0935.660.880
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Câu 317. (THPT 1 An)
2
6
2
6
cos 3
d
1
xx
xa
bc
xx
a
,
b
,
c
,
d
M a b c
.
A.
35M
. B.
41M
. C.
37M
. D.
35M
.
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Câu 318. TPHCM )
f
và
g
F
và
G
trên
1;2
11F
,
24F
,
3
1
2
G
,
22G
và
2
1
67
d
12
f x G x x
.
Tính
2
1
dF x g x x
A.
11
12
. B.
145
12
. C.
11
12
. D.
145
12
.
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-Bài 3. Tích Phân
209
Tel: 0935.660.880
Câu 319. (THPT Phú
y f x
0;
4
mãn
3
4
f
,
4
0
d1
cos
fx
x
x
và
4
0
sin .tan . d 2x x f x x
. Tích phân
4
0
sin . dx f x x
A.
4
. B.
2 3 2
2
. C.
1 3 2
2
. D.
6
.
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Câu 320.(SGD Thanh Hóa Cho
4
0
sin2 ln tan 1 dx x x
ln2a b c
a
,
b
,
c
Tính
11
Tc
ab
.
A.
2T
. B.
4T
. C.
6T
. D.
4T
.
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Câu 321.(THPT Thúc An) Cho
2
2
1
ln 1
d ln2
1
x x a
Ix
bc
x
a
,
b
,
m
ab
S
c
.
A.
2
3
S
. B.
5
6
S
. C.
1
2
S
. D.
1
3
S
.
-Bài 3. Tích Phân
210
Tel: 0935.660.880
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Câu 322.(Chuyên Thái Bình)
3
2
0
ln 16 d ln5 ln2
2
c
x x x a b
,,abc
T a b c
.
A.
2T
. B.
16T
. C.
2T
. D.
16T
.
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Câu 323.
m
2
0
2
.cos d
2
m
x mx x
.
m
A.
7
;2
4
. B.
1
0;
4
. C.
6
1;
5
. D.
58
;
67
.
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-Bài 3. Tích Phân
211
Tel: 0935.660.880
Câu 324.Long)
1
2
2
0
d.
2
x
x e a
x e c
b
x
a
,
c
b
a
b
a b c
.
A.
3
. B.
0
. C.
2
. D.
3
.
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Câu 325.
2
0
2 ln 1 d .lnx x x a b
*
,a b N
,
b
Tính
67ab
.
A.
33
. B.
25
. C.
42
. D.
39
.
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Câu 326.
2
0
2 ln 1 d .lnx x x a b
*
,a b N
,
b
Tính
67ab
.
A.
33
. B.
25
. C.
42
. D.
39
.
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-Bài 3. Tích Phân
212
Tel: 0935.660.880
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Câu 327.
n
1
22
0
1d
n
n
I x x x
.
Tính
1
lim
n
n
n
I
I
.
A.
1
. B.
2
. C.
3
. D.
5
.
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Câu 328. Cho
2
1
()
2
Fx
x
()fx
x
.
Tính
e
1
( )ln df x x x
A.
2
2
e3
2e
I
. B.
2
2
2e
e
I
. C.
2
2
e2
e
I
. D.
2
2
3e
2e
I
.
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Câu 329.
4
4
0
1
21
x
xe
dx ae b
x
. Tính
22
T a b
-Bài 3. Tích Phân
213
Tel: 0935.660.880
A.
1T
. B.
2T
. C.
3
2
T
. D.
5
2
T
.
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Câu 330.(THPT Kinh Môn 2 - )
fx
và
2 16f
,
2
0
d4f x x
. Tính tích phân
1
0
. 2 dI x f x x
.
A.
13I
. B.
12I
. C.
20I
. D.
7I
.
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Câu 331. Chính 2018 ) Cho
e
2
1
1 ln d e ex x x a b c
a
,
b
,
c
A.
a b c
. B.
a b c
. C.
a b c
. D.
a b c
.
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-Bài 3. Tích Phân
214
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Câu 332. Chính 2018) Cho
2
1
2 ln d
e
x x x ae be c
,,abc
nào
A.
a b c
. B.
a b c
. C.
a b c
. D.
a b c
.
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Câu 333.(Mã 105THQG 2018) Cho
2
1
1 ln
e
x x dx ae be c
,,abc
.
A.
a b c
. B.
a b c
. C.
a b c
. D.
a b c
.
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.
Câu 334. (THPT Chuyên Vinh)
y f x
0;1
và
0 1 0ff
1
2
0
1
d
2
f x x
,
1
0
cos d
2
f x x x
. Tính
1
0
df x x
.
A.
. B.
1
. C.
2
. D.
3
2
.
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-Bài 3. Tích Phân
215
Tel: 0935.660.880
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Câu 335.(S GD- Ninh Bình) Cho
tan d
n
n
I x x
n
.
0 1 2 3 8 9 10
2 ...I I I I I I I
A.
9
1
tan
r
r
x
C
r
. B.
1
9
1
tan
1
r
r
x
C
r
. C.
10
1
tan
r
r
x
C
r
. D.
1
10
1
tan
1
r
r
x
C
r
.
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Câu 336.(Chuyên Cho
2
0
2 1 e d
m
x
I x x
m
Im
;ab
. Tính
3P a b
.
A.
3P
. B.
2P
. C.
4P
. D.
1P
.
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A. LÝ THUYẾT
I. TÍNH DIỆN TÍCH HÌNH PHẲNG.
1. Định Lý: Cho hàm số
y f x
liên tục, không âm trên đoạn
;ab
.
Khi đó diện tích
S
của hình thang cong giới hạn bởi đồ thị hàm số
y f x
, trục hoành và hai đường thẳng
, x a x b
là
.
b
a
S f x dx
Ví dụ 1. Tính diện tích hình phẳng giới hạn bởi các đường
1 ln x
y
x
, trục
Ox
và hai đường
thẳng
1x
,
xe
.
Lời giải
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2. Một số bài toán tính diện tích hình phẳng.
Bài toán 1. Cho hàm số
y f x
liên tục trên đoạn
;ab
. Khi đó diện tích
S
của hình phẳng
D
giới hạn bởi đồ thị
0
y f x
truchoanhOx y
xa
xb
là
b
a
S f x dx
.
Nhận xét:
Vì ta chưa biết hàm số
y f x
trên đoạn
;ab
biết dương hay âm nên ta phải dùng trị
tuyệt đối.
Để phá trị tuyệt đối ta làm hai cách như sau
Cách 1: lập bảng xét dấu
Giải phương trình
0fx
tìm nghiệm
12
, ,..., ;
n
x x x a b
12
...
n
x x x
.
Lập bảng xét dấu. Suy ra khoảng dương hoặc âm.
Dựa trên khoảng dương (dấu
) hoặc âm (dấu
) để mở ra trị tuyệt đối.
Tính
12
1
dd
xx
ax
S f x x f x x
... d
n
b
x
f x x
1
d ... d
n
xb
ax
f x x xf x
.
Cách 2: không cần lập bảng xét dấu
Áp dụng trực tiếp công thức
1 2 1
1
d d ... d d ... d
nn
x x b x b
a x x a x
S f x x f x x f x x f x x x f x
.
Nếu bài toán chưa cho cận
;x a x b
thì ta giải phương trình
1
0 ...
n
xx
fx
xx
tìm cận.
BI 4 . ỨNG DỤNG TÍNH DIỆN TÍCH-THỂ TÍCH
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Ví dụ 2. Tính diện tích hình phẳng giới hạn bởi các đường
2
4yx
,
0y
và hai đường thẳng
1, 3xx
.
Lời giải
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Ví dụ 3. Tính diện tích hình phẳng giới hạn bởi các đường
x
y xe
, trục
Ox
và hai đường thẳng
1x
,
2x
.
Lời giải
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Ví dụ 4. Tính diện tích hình phẳng giới hạn bởi các đường
2
1y x x
, trục hoành và đường
thẳng
1x
.
Lời giải
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Bài toán 2.
Diện tích hình phẳng giới hạn bởi hai đồ thị
y f x
;
y g x
và hai đường đường
; x a x b
là
b
a
S f x g x dx
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Ví dụ 5. Tính diện tích hình phẳng giới hạn bởi các đường
2
4y x x
và
.yx
Lời giải
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Ví dụ 6. Tính diện tích hình phẳng giới hạn bởi các đường
32
69y x x x
và
yx
.
Lời giải
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II. Tính thể tích khối tròn xoay
1. Tính thể tích của vật thể
Định lí. Cắt một vật thể
C
bởi hai mặt phẳng
P
và
Q
vuông
góc với trục
Ox
lần lượt tại
, x a x b a b
.
Một mặt phẳng bất kì vuông góc với
Ox
tại điểm
x a x b
cắt
C
theo một thiết diện có diện tích
Sx
. Giả sử
Sx
là hàm
liên tục trên đoạn
;ab
.
Khi đó thể tích của vật thể
C
giới hạn bởi hai mặt phẳng
P
và
Q
được tính theo công thức
d
b
a
V S x x
2. Tính thể tích vậy tròn xoay
Bài toán 1. Tính thể tích vật thể tròn xoay khi quay miền
D
được
giới hạn bởi các đường
; 0y f x y
;
;xa
xb
quanh trục
Ox
được tính theo công thức
2
b
a
V f x dx
Nhận xét: công thức này áp dụng tính thể tích giới hạn bởi một
đường cong
;y f x
Ví dụ 7. Cho hình phẳng
H
giới hạn bởi các đường
2
2y x x
,
0y
.
Tính thể tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
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Lời giải
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Ví dụ 8. Cho hình phẳng
H
giới hạn bởi các đường
2
lny x x
, trục hoành và
xe
. Tính
thể tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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Bài toán 2. Tính thể tích vật thể tròn xoay khi quay miền
D
được
giới hạn bởi các đường
; y f x y g x
;
;xa
xb
với
. 0, ;f x g x x a b
quanh trục
Ox
được tính theo công thức
22
b
a
V f x g x dx
Nhận xét: công thức này áp dụng tính thể tích giới hạn bởi hai
đường cong
;y f x
Ví dụ 9. Thể tích khối tròn xoay khi cho hình phẳng giới hạn bởi parapol (P):
2
yx
và đường
thẳng d:
2yx
quay xung quanh trục
Ox
bằng:
Lời giải
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Ví dụ 10. Cho hình phẳng
H
giới hạn bởi các đường
2
50xy
và
30xy
. Tính thể
tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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Ví dụ 11. Tính thể tích khối tròn xoay được tạo bởi phép quay quanh trục
Ox
hình phẳng giới
hạn bởi các đường
yx
;
2yx
và
0y
.
Lời giải
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Ví dụ 12. Thể tích khối tròn xoay sinh bởi hình phẳng giới hạn bởi đồ thị hai hàm số
2
2y x x
,
2
4yx
khi nó quanh quanh trục hoành là:
Lời giải
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Bài toán 3. Tính thể tích vật thể tròn xoay khi quay miền
D
được
giới hạn bởi các đường
x g y
;
, y a y b
với
quanh trục
Oy
được tính theo công thức
2
b
a
V g y dy
Nhận xét:
Công thức này áp dụng tính thể tích giới hạn một đường cong
x g y
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Tính thể tích vật thể tròn xoay khi quay miền
D
được giới hạn
bởi các đường
; x f y x g y
;
;ya
yb
với
. 0, ;f y g y y a b
quanh trục
Oy
được tính theo công thức
22
b
a
V f y g y dy
Ví dụ 13. Cho hình phẳng
H
giới hạn bởi các đường
2
yx
và
2
8xy
. Tính thể tích của khối
tròn xoay tạo thành khi quay hình
H
quanh trục tung.
Lời giải
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Ví dụ 14. Tính thể tích hình khối do hình phẳng giới hạn bởi các đường:
2
5xy
,
3xy
quay quanh
Oy
.
Lời giải
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III. Ứng dụng vật lý.
Ta tìm quãng đường, vận tốc và gia tốc dựa vào sơ đồ sau:
Ví dụ 15.(THPT Hai Bà Trưng-Huế) Một chất điểm chuyển động trên trục
Ox
với vận tốc thay
đổi theo thời gian
2
3 6 /v t t t m s
. Tính quãng đường chất điểm đi được từ thời điểm
1
0,t
2
4t
(s).
A.
24
. B.
8
. C.
12
. D.
16
.
Lời giải
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Ví dụ 16.(THPT Lương Thế Vinh Đồng Nai) Một ô tô đang chạy với tốc độ
20 /ms
thì người
lái đạp phanh, từ thời điểm đó ô tô chuyển động chậm dần đều với vận tốc
5 20 /v t t m s
,
trong đó
t
là khoảng thời gian tính bằng giây, kể từ lúc bắt đầu đạp phanh. Hỏi từ lúc đạp phanh
đến khi dừng hẳn, ô tô còn di chuyển bao nhiêu mét (
m
)?
A.
20 m
. B.
30 m
. C.
10 m
. D.
40 m
.
Lời giải
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Ví dụ 17.(Sở GD và ĐT Hưng Yên) Một vật chuyển động với vận tốc
10 /ms
thì tăng tốc với gia
tốc
22
1
2/
3
a t t t m s
, trong đó
t
là khoảng thời gian tính bằng giây kể từ lúc bắt đầu tăng
tốc. Hỏi quãng đường vật đi được trong 12 giây kể từ lúc bắt đầu tăng tốc bằng bao nhiêu mét?
A.
1272 m
. B.
456 m
. C.
1172 m
D.
1372 m
.
Lời giải
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Ví dụ 18.(THPT Chuyên Bắc Giang) Một ô tô đang chạy với vận tốc
20
m/s
thì người lái đạp
phanh, từ thời điểm đó, ô tô chuyển động chậm dần đều với vận tốc
10 20v t t
(
m/s
), trong
đó
t
là khoảng thời gian tính bằng giây, kể từ lúc bắt đầu đạp phanh. Hỏi từ lúc đạp phanh đến khi
dừng hẳn, ô tô còn di chuyển bao nhiêu mét ?
A.
5m
. B.
20m
. C.
40m
. D.
10m
.
Lời giải
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Ví dụ 19.(THPT Quỳnh Lưu Nghệ An) Một ô tô đang chạy với vận tốc là
12 /ms
thì người lái
đạp phanh; từ thời điểm đó ô tô chuyển động chậm dần đều với vận tốc
6 12v t t
/ms
,
trong đó
t
là khoảng thời gian tính bằng giây kể từ lúc đạp phanh. Hỏi từ lúc đạp phanh đến lúc ô
tô dừng hẳn, ô tô còn di chuyển được bao nhiêu mét?
A.
8m
. B.
12m
. C.
15m
. D.
10m
.
Lời giải
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Ví dụ 20.(THPT Chuyên Hưng Yên) Một tay đua đang điều khiển chiếc xe đua của mình với vận
tốc
180 km/h
. Tay đua nhấn ga để về đích kể từ đó xe chạy với gia tốc
2
2 1 m/sa t t
. Hỏi
rằng
4s
sau khi tay đua nhấn ga thì xe đua chạy với vận tốc bao nhiêu
km/h
A.
200 km/h
. B.
252 km/h
. C.
288 km/h
. D.
243 km/h
.
Lời giải
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B. PHÂN DẠNG V BI TẬP MINH HỌA
DẠNG 1. Tính diện tích hình phẳng giới hạn bởi một đồ thị hàm số
y f x
, trục hoành
Ox
và
hai đường thẳng
,x a x b
.
1. Phương pháp.
Bước : Áp dụng công thức diện tích là
d
b
a
S f x x
Bước : Để phá trị tuyệt đối ta làm hai cách sau:
Cách 1. Dùng bảng xét dấu (nhị thức bậc nhất, tam thức bậc
hai...) xét dấu biểu thức
fx
từ đó bỏ dấu giá trị tuyệt đối.
Cách 2.
(Không dùng bảng xét dấu)
Nếu hàm số
fx
giữ nguyên một dấu trong đoạn
;ab
(hay
phương trình
0fx
vô nghiệm trên khoảng
;ab
) thì đưa
dấu giá trị tuyệt đối ra bên ngoài dấu tích phân.
Tức là
dd
bb
aa
S f x x f x x
Nếu phương trình
0fx
có các nghiệm
12
...
n
c c c
nằm trong khoảng
;ab
thì tách
S
thành tổng các tích phân
trên các đoạn.
Nghĩa là
12
.d d d ... d
n
cc
bb
a a xc c
S f x x f x x f x x f x x
Đặc biệt: Nếu giả thiết không cho các cận
a
,
b
thì ta giải tìm nó bằng cách giải phương trình
hoành độ giao điểm
0fx
ta tìm các cận của tích phân.
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2. Bài tập minh họa.
Bài tập 1. Tính diện tích hình phẳng giới hạn bởi các đường
1
x
ye
, trục hoành và hai
đường thẳng
ln3x
,
ln8x
.
Lời giải
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Bài tập 2. Tính diện tích hình phẳng được giới hạn bởi các đường
ln 3 1
xx
y e e
, trục hoành
và các đường thẳng
0, ln5xx
.
Lời giải
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Bài tập 3. Tính diện tích hình phẳng được giới hạn bởi các đường
2
cosy x x
, trục hoành và
các đường thẳng
0,
4
xx
.
Lời giải
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Bài tập 4. Tính diện tích hình phẳng giới hạn bởi đường
2
43y x x
và trục hoành.
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Lời giải
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3. Câu hỏi trắc nghiệm.
Mức đô 1. Nhận biết.
Câu 1.(THPT Chuyên Nguyễn Quang Diệu 2019) Ký hiệu
S
là diện
tích hình phẳng giới hạn bởi đồ thị hàm số
y f x
, trục hoành,
đường
, x a x b
( như hình vẽ). Khẳng định nào sau đây là đúng?
A.
d
b
a
S f x x
. B.
dd
cb
ac
S f x x f x x
.
C.
dd
cb
ac
S f x x f x x
. D.
dd
cb
ac
S f x x f x x
.
Lời giải
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Câu 2.(THPT Kim Liên 2018) Cho đồ thị hàm số
y f x
. Diện
tích
S
của hình phẳng (phần tô đen trong hình vẽ) được tính
theo công thức dưới đây?
A.
04
30
ddS f x x f x x
. B.
4
3
dS f x x
.
C.
04
30
ddS f x x f x x
. D.
14
31
ddS f x x f x x
.
Lời giải
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Câu 3.(THPT Nguyễn Tất Thành Yên Bái) Diện tích của hình
phẳng được giới hạn bởi đồ thị hàm số
y f x
, trục hoành
và hai đường thẳng
xa
,
xb
ab
(phần tô đậm trong
hình vẽ) tính theo công thức nào dưới đây ?
A.
dd
cb
ac
S f x x f x x
. B.
d
b
a
S f x x
.
C.
dd
cb
ac
S f x x f x x
. D.
d
b
a
S f x x
.
Lời giải
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Câu 4.(Sở GD & ĐT Cà Mau) Diện tích phần hình phẳng gạch chéo
trong hình vẽ bên dưới được tính theo công thức nào sau đây?
A.
2
42
1
13
4d
22
x x x x
. B.
2
42
1
13
1d
22
x x x x
.
C.
2
42
1
13
1d
22
x x x x
. D.
2
42
1
13
4d
22
x x x x
.
Lời giải
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Câu 5.(THPT Chuyên Hưng Yên 2019) Cho hàm số
y f x
có
đồ thị trên đoạn
1;4
như hình vẽ dưới đây.
Tính tích phân
4
1
I f x dx
.
A.
3.I
B.
11
.
2
I
C.
5.I
D.
5
.
2
I
Lời giải
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Câu 6.(THPT Chuyên Thái Nguyên 2019) Diện tích hình phẳng giới hạn bởi đồ thị hàm số
2
28y x x
và trục hoành được xác định theo công thức nào dưới đây
A.
2
2
4
2 8 dS x x x
. B.
4
2
2
2 8 dS x x x
.
C.
2
2
4
2 8 dS x x x
. D.
4
2
2
8 2 dS x x x
.
Lời giải
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Mức độ 2. Thông hiểu.
Câu 7.(THPT Thị Xã Quãng Trị 2019) Diện tích hình phẳng giới hạn bởi ba đường
1
1
x
y
x
,
0y
,
0x
bằng
A.
1 ln3
. B.
1 ln 4
. C.
1 ln 4
. D.
1 ln 2
.
Lời giải
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Câu 8.(THTT Số 4-487-2018) Gọi
S
là diện tích hình phẳng giới hạn bởi đồ thị hàm số
1
:
1
x
Hy
x
và các trục tọa độ. Khi đó giá trị của
S
bằng
A.
ln2 1S
. B.
2ln2 1S
C.
2ln2 1S
. D.
ln2 1S
.
Lời giải
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Câu 9.(THPT Tư nghĩa 2019) Tính diện tích của hình phẳng giới hạn bởi các đường
1 lny x x
, trục hoành và đường thẳng
xe
.
A.
2
5
4
e
S
. B.
2
7
6
e
S
. C.
2
3
2
e
S
. D.
2
9
8
e
S
.
Lời giải
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Câu 10.(THPT Lê Xoay 2019)Gọi
S
là diện tích hình phẳng giới hạn bởi đồ thị của hàm số
:H
1
1
x
y
x
và các trục tọa độ. Khi đó giá trị của
S
bằng
A.
2ln 2 1
. B.
ln 2 1
. C.
ln 2 1
. D.
2ln 2 1
.
Lời giải
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Câu 11.(THPT Ngô Quyền Hải Phòng 2019)Gọi
S
là diện tích của hình phẳng giới hạn bởi đồ thị
C
của hàm số
2
1y x x
, trục hoành, trục tung và đường thẳng
1x
. Biết
2S a b
,ab
. Tính
ab
.
A.
1
6
ab
. B.
1
2
ab
. C.
1
3
ab
. D.
0ab
.
Lời giải
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Câu 12.(THPT Chuyên Ngoại Ngữ Hà Nội 2019) Tính diện tích hình phẳng giới hạn bởi đồ thị
hàm số
lny x x
, trục
Ox
và đường thẳng
xe
?
A.
2
1
4
e
S
. B.
2
3
4
e
S
. C.
2
1
2
e
S
. D.
2
1
2
e
S
.
Lời giải
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Mức độ 3. Vận dụng.
Câu 13.(THPT Chuyên Hà Tĩnh 2019)Cho
H
là hình phẳng
giới hạn bởi
,yx
2yx
và trục hoành (hình vẽ). Diện
tích của
H
là phần bị gạch chéo trong hình vẽ sau là
A. . B. . C. . D. .
Lời giải
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Câu 14.(THPT Chuyên Vinh) Gọi là diện tích hình phẳng giới
hạn bởi đồ thị hàm số và trục hoành
như hình vẽ. Mệnh đề nào sau đây sai?
A. . B. .
C. . D. .
Lời giải
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Câu 15.(Chuyên Vinh 2019)Gọi là diện tích hình phẳng giới
hạn bởi đồ thị hàm số và trục hoành như hình
vẽ. Mệnh đề nào sau đây đúng?
A. . B. .
C. . D. .
Lời giải
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8
3
11
3
7
3
10
3
S
32
11
1
33
f x x x x
13
11
ddS f x x f x x
3
1
2dS f x x
1
1
2dS f x x
3
1
dS f x x
S
3
4f x x x
2
2
dS f x x
0
2
2dS f x x
2
0
2dS f x x
02
20
dS f x f x x
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Câu 16.(THPT Nguyễn Huệ Huế) Diện tích phần hình phẳng
gạch chéo trong hình vẽ sau được tính theo công thức nào
dưới đây?
A.
02
3 2 3 2
10
2 d 2 dx x x x x x x x
.
B.
00
3 2 3 2
12
2 d 2 dx x x x x x x x
.
C.
00
3 2 3 2
12
2 d 2 dx x x x x x x x
.
D.
10
3 2 3 2
02
2 d 2 dx x x x x x x x
.
Lời giải
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Câu 17.(THPT Thăng Long 2019) Hình phẳng giới hạn bởi đồ
thị hàm số
y f x
và trục hoành gồm hai phần, phần nằm
phía trên trục hoành có diện tích
1
8
3
S
và phần nằm phía
dưới trục hoành có diện tích
2
5
12
S
(tham khảo hình vẽ
bên). Tính
0
1
31I f x dx
.
A.
5
3
I
. B.
3
4
I
. C.
37
36
I
. D.
27
4
I
.
Lời giải
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x
y
y=
x
3
-x
2
-2x
2
-1
O
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Câu 18.(Sở GD và Đào Tạo Nam Định 2019) Cho hàm số
()y f x
liên tục trên
và có đồ thị như hình vẽ sau.
Giá trị của
4
4
df x x
bằng
A.
4
. B.
8
. C.
12.
D.
10.
Lời giải
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Mức đô 3. Vận dụng cao.
Câu 19.(THPT Kim Liên 2019) Cho hàm số
y f x
liên tục trên
và có đồ thị như hình vẽ dưới đây. Biết diện tích hai phần
A
và
B
lần
lượt là
16
3
và
63
4
, tính
3
2
1
2 1 df x x
.
A.
253
12
. B.
253
24
. C.
125
24
. D.
125
12
.
Lời giải
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Câu 20.(THPT Chuyên Bắc Giang 2019) Cho hàm số
y f x
có đồ
thị như hình vẽ và diện tích hai phần
A
,
B
lần lượt bằng
12
và
2
.
Giá trị của
2
5
1
5 3 dI f x x
bằng.
A.
50
. B.
14
5
. C.
14
. D.
2
.
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Lời giải
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Câu 21. (THPT Gia Lộc 2019) Gọi
S
là diện tích hình phẳng giới hạn bởi đồ thị hàm số
2
2
1
xx
y
x
, đường thẳng
1yx
và các đường thẳng
xm
,
2xm
1m
. Tìm giá trị của
m
sao cho
ln3S
.
A.
5m
. B.
2m
. C.
4m
. D.
3m
.
Lời giải
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Câu 22.(THPT Chuyên Lam Sơn 2019)
Diện tích hình phẳng giới hạn bởi các đồ thị hàm số
5
x
y
x
;
2x
;
2x
và trục hoành là
A.
15ln10 10ln5
. B.
10ln5 5ln21
. C.
5ln21 ln5
. D.
121ln5 5ln21
.
Lời giải
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Câu 23.(Sở GD và ĐT Cần Thơ 2019) Cho hàm số
32
y ax bx cx d
với
a
,
b
,
c
,
d
. Gọi
1
S
,
2
S
là diện tích các
phần tô đậm như hình bên dưới. Mệnh đề nào sau đây là đúng?
A.
12
55
.S
8
S
. B.
12
S4S
. C.
12
8
S
5
S
. D.
1
2
2
S
S
.
Lời giải
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Câu 24.(Sở GD và Đào Tạo Hưng Yên 2019) Cho hàm số
y f x
có đạo hàm liên tục trên
1;2
. Đồ thị của hàm số
y f x
được cho như hình vẽ. Diện tích các hình phẳng
K
,
H
lần lượt là
5
12
và
8
3
. Biết
19
1
12
f
, tính
2f
.
A.
23
2
6
f
. B.
2
2
3
f
.
C.
2
2
3
f
. D.
11
2
6
f
.
Lời giải
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Câu 25.(THPT Chuyên Huỳnh Mẫn Đạt 2019) Cho hàm số
y f x
có đồ thị
y f' x
cắt trục
Ox
tại ba điểm có hoành độ
a <b<c
như hình vẽ. Mệnh đề nào dưới đây đúng?
A.
f c f a f b
. B.
f c f b f a
.
C.
f a f b f c
. D.
f b f a f c
.
Lời giải
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Câu 26.(THPT Thuận Thành 2019) Cho hàm số
y f x
có đạo hàm
liên tục trên , đồ thị hàm
y f x
như hình vẽ dưới đây. Khẳng
định nào trong các phương án
, , ,A B C D
dưới đây là đúng?
A.
2 1 0f f f
. B.
0 1 2f f f
.
C.
0 2 1f f f
. D.
1 0 2f f f
.
Lời giải
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Câu 27.(THPT Nghĩa Hưng 2019) Cho hàm số
y f x
có đạo hàm
liên tục trên . Hàm số
y f x
có đồ thị như hình vẽ bên dưới:
Số nghiệm thuộc đoạn
2;6
của phương trình
0f x f
là
A.
5
. B.
2.
C.
3.
D.
4.
Lời giải
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Câu 28.(THPT Trần Kỳ Phong-2018) Cho hàm số
y f x
có đạo
hàm
fx
liên tục trên và đồ thị hàm số
y f x
trên đoạn
2;6
như hình vẽ. Tìm khẳng định đúng.
A.
2;6
max 2yf
. B.
2;6
max 2yf
. C.
2;6
max 6yf
. D.
2;6
max 1yf
.
Lời giải
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Câu 29.(THPT Mộ Đức Quãng Ngãi 2018) Trong hệ trục tọa độ
Oxy
,
cho parabol
2
:P y x
và hai đường thẳng
ya
,
yb
0 ab
(hình vẽ). Gọi
1
S
là diện tích hình phẳng giới hạn bởi parabol
P
và đường thẳng
ya
(phần tô đen);
2
S
là diện tích hình phẳng
giới hạn bởi parabol
P
và đường thẳng
yb
(phần gạch chéo).
Với điều kiện nào sau đây của
a
và
b
thì
12
SS
?
A.
3
4ba
. B.
3
2ba
. C.
3
3ba
. D.
3
6ba
.
Lời giải
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DẠNG 2. Tính diện tích hình phẳng giới hạn bởi hai đồ thị hàm số
y f x
,
y g x
và hai
đường thẳng
,x a x b
.
1. Phương pháp.
Để tính diện tích giới hạn bởi
1
2
( ): ( )
( ): ( )
()
C y f x
C y g x
H
xa
xb
ta tiến
hành hai bước:
Bước : Áp dụng công thức diện tích cần tính là
.d
b
a
S f x g x x
Bước : Phá trị tuyệt đối như dạng 1.
2. Bài tập minh họa.
Bài tập 5. Cho hàm số
21
1
x
y
x
có đồ thị
C
. Tính diện tích hình phẳng giới hạn bởi các trục
tung, trục hoành và đồ thị
C
.
Lời giải
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Bài tập 6. Cho hàm số
2
22y x x
có đồ thị
C
. Tính diện tích hình phẳng giới hạn bởi đồ
thị
C
, tiếp tuyến của
C
tại điểm có hoành độ bằng
3
và trục tung.
Lời giải
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Bài tập 7. Tính diện tích hình phẳng giới hạn bởi các đường
2
ln x
y
x
và
2
4ln
2
x
y
x
.
Lời giải
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Bài tập 8. Tính diện tích hình phẳng giới hạn bởi các đường
1
x
y xe
và
x
y x e
.
Lời giải
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Bài tập 9. Tính diện tích hình phẳng giới hạn bởi các đường
x
y e x
,
10xy
và
ln5x
.
Lời giải
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Bài tập 10. Tính diện tích hình phẳng giới hạn bởi đường cong
11y x x
và đường
thẳng
1yx
Lời giải
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Bài tập 11. Tính diện tích hình phẳng giới hạn bởi các đường
2
16y x x
và
2
3 12y x x
.
Lời giải
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Bài tập 12. Tính diện tích hình phẳng giới hạn bởi các đường
sin2 , cosy x y x
và hai đường
thẳng
0,
2
xx
.
Lời giải
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Bài tập 13. Tính diện tích hình phẳng giới hạn bởi các đường
2
x
y
,
2
2y x x
và hai đường
thẳng
0, 2xx
.
Lời giải
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Bài tập 14. Tính diện tích hình phẳng giới hạn bởi đường cong
2
32y x x
và đường thẳng
2yx
.
Lời giải
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4. Câu hỏi trắc nghiệm.
Mức độ 1. Nhận biết.
Câu 30
.
(THPT Thị Xã Quảng Trị) Cho hàm số
y f x
và
y g x
có đồ thị giao nhau tại hai điểm phân biệt có
hoành độ
a
và
b
. Gọi
H
là hình phẳng được giới hạn bởi
đồ thị hai hàm số này
(phần tô đậm ở hình vẽ).
Diện tích của
H
được tính theo công thức
A.
d
b
a
S f x g x x
. B.
d
b
a
S g x f x x
.
C.
d
b
a
S f x g x x
. D.
d
b
a
S f x g x x
.
Lời giải
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Câu 31.(Sở GD và ĐT Quãng Bình 2019) Tính diện tích hình phẳng giới hạn bởi đồ thị các hàm số
2
21y x x
và
2
3yx
A.
9
.
2
B.
5
.
2
C. 4. D.
2
.
Lời giải
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Câu 32.(THPT Kinh Môn 2019) Tính diện tích hình phẳng giới hạn bởi đồ thị hai hàm số
2
4yx
và
2yx
?
A.
5
7
. B.
8
3
. C.
9
2
. D.
9
.
Lời giải
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Câu 33.(THPT Kim Liên 2019) Tính diện tích hình phẳng giới hạn bởi đồ thị hàm số
2
1yx
và
đường thẳng
3yx
.
A.
9
2
. B.
13
3
. C.
11
3
. D.
7
2
.
Lời giải
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Câu 34.(THPT Kim Liên 2017) Tính diện tích hình phẳng giới hạn bởi hai đồ thị hàm số
yx
;
6yx
và trục hoành.
A.
22
3
. B.
16
3
. C.
2
. D.
23
3
.
Lời giải
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Câu 35. (THPT Chuyên Quốc Học Huế) Tính diện tích
S
của hình phẳng
()H
giới hạn bởi các
đường cong
3
12y x x
và
2
yx
.
A.
937
12
S
. B.
343
12
S
. C.
793
4
S
. D.
397
4
S
.
Lời giải
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Câu 36.(Sở GD & ĐT Nam Định 2019)
Hình phẳng giới hạn bởi các đường cong
1y x x
và
3
y x x
có diện tích bằng
A.
37
12
. B.
5
12
. C.
8
3
. D.
9
4
.
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Lời giải
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Câu 37.(THPT Lê Qúy Đôn Quãng Ngãi 2019) Diện tích phần tô
đậm trong hình bên được tính theo công thức nào trong các
công thức sau?
A.
1
32
0
3 2 dx x x x
. B.
1
32
0
3 2 dx x x x
.
C.
2
32
0
3 2 dx x x x
. D.
2
32
0
3 2 dx x x x
.
Lời giải
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Câu 38.(KHTN Hà Nội 2019) Gọi
H
là phần hình phẳng gạch
chéo trong hình vẽ dưới đây được giới hạn bởi đồ thị của các
hàm số
2
3yx
,
4yx
và trục hoành.
Diện tích của
H
là bằng bao nhiêu?
A.
11
2
. B.
9
2
. C.
13
2
. D.
7
2
.
Lời giải
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Câu 39.(Sở GD & ĐT Sóc Trăng 2018) Tính diện tích hình
phẳng tạo thành bởi parabol
2
yx
, đường thẳng
2yx
và trục hoành trên đoạn
0;2
(phần gạch sọc trong hình)
A.
3
5
. B.
5
6
. C.
2
3
. D.
7
6
.
Lời giải
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Câu 40.(THPT Chuyên Hạ Long 2018) Tính diện tích hình phẳng giới hạn bởi các đường thẳng
4x
,
9x
và đường cong có phương trình
2
8yx
.
A.
76 2
3
. B.
152
3
. C.
76 2
. D.
152 2
3
.
Lời giải
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Câu 41.(Sở GD và ĐT Lạng Sơn 2019) Diện tích miền phẳng giới hạn bởi parabol
2
2
x
y
và
đường tròn có tâm tại gốc tọa độ, bán kính
22
thuộc khoảng nào sau đây.
A.
5;6
. B.
(4;5)
. C.
(7;8)
. D.
(6;7)
.
Lời giải
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Câu 42.(THPT Sơn Tây 2018) Cho
H
là hình phẳng giới hạn
bởi đường cong
yx
và nửa đường tròn có phương trình
2
4y x x
(với
04x
) (phần tô đậm trong hình vẽ).
Diện tích của
H
bằng
A.
4 15 3
24
. B.
8 9 3
6
. C.
10 9 3
6
. D.
10 15 3
6
Lời giải
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Câu 43.(Cụm Trần Kim Hưng Phú Yên 2019) Cho
H
là hình
phẳng giới hạn bởi parabol
2yx
, cung tròn có phương trình
2
8yx
(với
0 2 2x
) và trục hoành (phần tô đậm trong
hình vẽ). Tính diện tích
H
tính bởi công thức nào
A.
2
2
0
2 8 dx x x
. B.
2 2 2
2
02
2 d 8 dx x x x
.
C.
22
2
0
( 2 8 )dx x x
. D.
2
2
0
( 2 8 )dx x x
.
Lời giải
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Câu 44.(THPT Kinh Môn 2018) Cho hình phẳng được giới hạn bởi
các đường
2
4yx
,
2y
,
yx
có diện tích là
.S a b
.
Chọn kết quả đúng:
A.
1a
,
1b
. B.
1ab
. C.
23ab
. D.
22
45ab
.
Lời giải
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x
y
3
2
1
-3
-2
-1
3
2
O
1
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Câu 45.(Đề tham khảo BGD 2018) Cho
H
là hình phẳng giới hạn
bởi parabol
2
3yx
, cung tròn có phương trình
2
4yx
(với
02x
) và trục hoành (phần tô đậm trong hình vẽ). Diện tích
của
H
bằng
A.
43
12
. B.
43
6
. C.
4 2 3 3
6
. D.
5 3 2
3
.
Lời giải
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Câu 46.(THPT Đặng Thúc Hứa 2018) Tính diện tích hình phẳng
giới hạn bởi nửa đường tròn
2
2yx
và đường thẳng
d
đi
qua hai điểm
2;0A
và
1;1B
(
phần tô đậm như hình vẽ)
A.
22
4
. B.
3 2 2
4
. C.
22
4
. D.
3 2 2
4
.
Lời giải
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Câu 47.(THPT Thạch Thành 2019) Diện tích phần hình
phẳng gạch chéo trong hình vẽ được tính theo công thức
nào dưới đây?
A.
2
2
1
2 2 4 dx x x
. B.
2
1
2 2 dxx
.
C.
2
1
2 2 dxx
. D.
2
2
1
2 2 4 dx x x
Lời giải
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Câu 48.(Đặng Thành Nam)Diện tích hình phẳng giới hạn bởi parabol
2
( 2) ,yx
đường cong
3
yx
và trục hoành bằng (phần tô đậm trong
hình vẽ bên)
A.
11
.
2
B.
73
.
12
C.
7
.
12
D.
5
.
2
Lời giải
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Câu 49.(THPT Chuyên Lê Thánh Tông 2019) Cho hình phẳng
H
giới hạn bởi các đường
yx
;
yx
;
5x
. Thể tích khối tròn xoay được tạo thành khi quay hình phẳng
H
xung quanh
trục
Ox
là
A.
5
2
0
dV x x x
B.
15
22
01
ddV x x x x x x
C.
5
2
0
dV x x x
D.
5
2
1
dV x x x
Lời giải
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Câu 50.(Sở GD và ĐT Đà Nẵng 2019)
Cho đồ thị hai hàm số
32
33y x x x
và
2
21y x x
như hình sau. Diện tích phần hình phẳng được gạch sọc tính
theo công thức nào dưới đây?
A.
12
3 2 3 2
11
2 2 d 2 2 dx x x x x x x x
.
B.
2
32
1
2 2 dx x x x
.
C.
12
3 2 3 2
11
2 2 d 2 2 dx x x x x x x x
.
D.
2
32
1
2 2 dx x x x
.
Lời giải
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Câu 51.(Chuyên Đại Học Sư Phạm Hà Nội 2018) Cho số dương
a
thỏa mãn hình phẳng giới hạn
bởi các đường parabol
2
2y ax
và
2
42y ax
có diện tích bằng 16. Giá trị của
a
bằng
A.
2
. B.
1
4
. C.
1
2
. D.
1
.
Lời giải
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Câu 52.(THPT Tây Thụy Anh Thái Bình 2018) Tìm
a
để diện tích
S
của hình phẳng giới hạn bởi
2
2
:,
1
xx
Py
x
đường thẳng
:1d y x
và
,xa
2xa
( 1)a
bằng
ln3
?
A.
1.a
B.
4.a
C.
3.a
D.
2.a
Lời giải
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Câu 53.(Chuyên Đại Học Vinh) Gọi là diện tích hình phẳng
giới hạn bởi đồ thị của hai hàm số và
. Mệnh đề nào sau đây sai?
A. .
B. .
C. .
D. .
Lời giải
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Câu 54.(THPT Chuyên Trần Phú 2018) Cho parabol
P
có đồ thị như
hình vẽ. Tính diện tích hình phẳng giới hạn bởi
P
với trục hoành.
A.
4
. B.
2
. C.
8
3
. D.
4
3
.
Lời giải
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Câu 55.(Sở GD & ĐT Hà Nam 2018) Gọi tam giác cong
()OAB
là hình phẳng giới hạn bởi đồ thị các hàm số
2
2yx
,
3yx
,
0y
(tham khảo hình vẽ bên). Diện tích của
OAB
bằng
A.
8
3
. B.
5
3
C.
4
3
. D.
10
3
.
S
3
12f x x x
2
g x x
4
3
dS f x g x x
04
30
ddS f x g x x g x f x x
4
3
dS f x g x x
04
30
ddS f x g x x f x g x x
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Câu 56.(THPT Chuyên Thái Nguyên 2019)
Cho hàm số
32
,,y x ax bx c a b c
có đồ thị
C
và
hàm số
2
,,y mx nx p m n p
có đồ thị
P
như hình
vẽ. Tính diện tích hình phẳng giới hạn bởi
C
và
P
có giá
trị nằm trong khoảng nào sau đây?
A.
0;1
. B.
1;2
. C.
2;3
. D.
3;4
.
Lời giải
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Câu 57.(Đề Chính Thức 2018)
Cho hai hàm số
32
3
4
f x ax bx cx
và
2
3
4
g x dx ex
,
, , , ,a b c d e
. Biết rằng đồ thị của hàm số
y f x
và
y g x
cắt nhau tại ba điểm có hoành độ lần lượt là
2
;
1
;
3
(hình vẽ bên).
Hình phẳng giới hạn bởi hai đồ thị đã cho có diện tích bằng
A.
253
48
. B.
125
24
. C.
125
48
. D.
253
24
.
Lời giải
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Câu 58.(Chuyên KHTN 2018) Cho hàm số
42
y ax bx c
có đồ thị
C
, biết rằng
C
đi qua điểm
1;0A
, tiếp tuyến
d
tại
A
của
C
cắt
C
tại hai điểm có hoành độ lần lượt là
0
và
2
và diện
tích hình phẳng giới hạn bởi
d
, đồ thị
C
và hai đường thẳng
0x
;
2x
có diện tích bằng
28
5
(phần tô màu trong hình vẽ).
Diện tích hình phẳng giới hạn bởi
C
và hai đường thẳng
1x
;
0x
có diện tích bằng
A.
2
5
. B.
1
4
. C.
2
9
. D.
1
5
.
Lời giải
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Câu 59. (THPT Lê Quý Đôn-Hà Nội 2018) Cho parabol
2
:P y x
và hai điểm
A
,
B
thuộc
P
sao cho
2AB
. Tìm giá trị lớn nhất của diện tích hình phẳng giới hạn bởi parabol
P
và đường
thẳng
AB
.
A.
3
2
. B.
4
3
. C.
3
4
. D.
5
6
.
Lời giải
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Câu 60.(THPT Ngọc Tảo Hà Nội 2018) Cho hàm số
42
3y x x m
có đồ thị
m
C
, với
m
là tham số thực. Giả sử
m
C
cắt trục
Ox
tại
bốn điểm phân biệt như hình vẽ
Gọi
1
S
,
2
S
,
3
S
là diện tích các miền gạch chéo được cho trên hình
vẽ. Giá trị của
m
để
1 3 2
S S S
là
A.
5
2
. B.
5
4
. C.
5
4
. D.
5
2
.
Lời giải
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DẠNG 3. Tính diện tích hình phẳng giới hạn bởi ba đồ thị hàm số
y f x
,
,y g x y h x
.
1. Phương pháp.
Bước : Tìm hoành độ giao điểm của từng đồ thị:
f x g x x c
f x h x x a
h x g x x b
Bước : Vẽ đồ thị của ba hàm số
,y f x
,y g x y h x
.
để tách thành tổng của hai tích phân.
( ) ( ) ( ) ( )
cb
ac
S f x h x dx g x h x dx
2. Bài tập minh họa.
Bài tập 15. Diện tích hình phẳng giới hạn bởi đồ thị
C
của hàm số
2
1
43
2
y x x
và hai
tiếp tuyến của
C
xuất phát từ
3; 2M
là
Lời giải
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Bài tập 16. Tính diện tích hình phẳng giới hạn bởi đường cong
2
: 4 3P y x x
và
D
:
3.yx
Lời giải
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Bài tập 17. Tính diện tích hình phẳng giới hạn bởi hai đường cong
2
:1P y x
và
D
:
5.yx
Lời giải
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Bài tập 18. Tính diện tích hình phẳng giới hạn bởi đường cong
2
2
1 2 3
27
: , : , : .
8
x
C y x C y C y
x
Lời giải
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3. Câu hỏi trắc nghiệm.
Mức độ 3. Vận dụng
Câu 61.(THPT Ngô Quyền 2019) Diện tích miền hình phẳng giới hạn bởi các đường
3yx
2
x
y
,
1y
bằng
A.
1
3
ln2
. B.
11
ln2 2
. C.
1
1
ln2
. D.
1
2
ln2
.
Lời giải
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Câu 62.(Tạp Chí Toán Học 2018) Tính diện tích hình phẳng giới hạn bởi đồ thị
2
: 4 5P y x x
và các tiếp tuyến của
P
tại
1;2A
và
4;5B
.
A.
9
4
. B.
4
9
. C.
9
8
. D.
5
2
.
Lời giải
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Câu 63.(THPT Hồng Lĩnh Hà Tĩnh 2018) Diện tích hình phẳng giới hạn bởi đồ thị hàm số
yx
và tiếp tuyến với đồ thị tại
4,2M
và trục hoành là
A.
8
3
. B.
3
8
. C.
1
3
. D.
2
3
.
Lời giải
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Câu 64.(Chuyên KHTN 2018) Tính diện tích hình phẳng giới hạn bởi parabol
2
6 12y x x
và
các tiếp tuyến tại các điểm
1;7A
và
1;19B
.
A.
1
3
. B.
2
3
. C.
4
3
. D.
2
.
Lời giải
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Câu 65.(Sở GD& ĐT Đồng Tháp 2018) Diện tích hình phẳng nằm trong góc phần tư thứ nhất, giới
hạn bởi các đường thẳng
8yx
,
yx
và đồ thị hàm số
3
yx
là phân số tối giản
a
b
. Khi đó
ab
bằng
A.
62
. B.
67
. C.
33
. D.
66
.
Lời giải
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DẠNG 4. Tính diện tích hình phẳng giới hạn bởi các đồ thị hàm số có dạng
x f y
và hai đường
thẳng
,y a y b
.
1. Phương pháp.
Để tính diện tích giới hạn bởi
()
()
()
x f y
x g y
H
ya
yb
ta tiến hành hai bước:
Bước : Áp dụng công thức diện tích cần tính là
.d
b
a
S f y g y y
Bước : Phá trị tuyệt đối như dạng 1.
2. Bài tập minh họa.
Bài tập 19. Tính diện tích hình phẳng giới hạn bởi các đường
2
21yx
và
1yx
.
Lời giải
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Bài tập 20. Tính diện tích hình phẳng giới hạn bởi các đường
2
4,yx
23
(4 )yx
.
Lời giải
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3. Câu hỏi trắc nghiệm.
Câu 66.(THPT Kim Liên 2019) Cho hình phẳng
H
giới hạn bởi đường cong
2
20y y x
và
đường thẳng
20xy
. Tính diện tích
S
của hình
H
.
A.
6S
. B.
14S
. C.
17
6
S
. D.
1
6
S
.
Lời giải
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DẠNG 5. Tính thể tích vật thể giới hạn bởi một đồ thị hàm số có dạng
,,y f x x a x b
và
trục hoành
0y
khi quay quanh trục hoành
Ox
.
1. Phương pháp.
Để tính thể tích vật thể giới hạn bởi
( ): ( )
( ): 0
( ):
C y f x
Ox y
H
xa
xb
ta tiến
hành hai bước:
Bước : Áp dụng công thức diện tích cần tính là
22
d d .
bb
aa
V f x x y x
Bước : Tính tích phân.
2. Bài tập minh họa.
Bài tập 21. Cho hình phẳng
H
giới hạn bởi các đường
1
1 4 3
y
x
, trục hoành, trục tung
và
1x
. Tính thể tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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Bài tập 22. Cho hình phẳng
H
giới hạn bởi các đường
3
1
2
x
y
e
, trục hoành và
0x
,
3ln2x
. Tính thể tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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Bài tập 23. Cho hình phẳng
H
giới hạn bởi các đường
cos
x
y
x
, trục hoành và
4
x
.
Tính thể tích của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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3. Câu hỏi trắc nghiệm.
Mức độ 1. Nhận biết
Câu 67.(Sở GD và ĐT Đồng Tháp 2018) Cho hình phẳng
D
giới hạn bởi đường cong
sinyx
, trục
hoành và các đường thẳng
0,x
6
x
. Khối tròn xoay tạo thành khi quay
D
quanh trục hoành
có thể tích bằng bao nhiêu?
A.
3
4 3 2
V
. B.
1
23
2
V
. C.
23
2
V
. D.
13
4 3 2
V
.
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Câu 68.(THPT Đức Thọ-Hà Tĩnh 2018) Tính thể tích
V
của vật thể tròn xoay sinh ra khi cho hình
phẳng giới hạn bởi các đường
1
y
x
,
0y
,
1x
,
xa
,
1a
quay xung quanh trục
Ox
.
A.
1
1V
a
. B.
1
1V
a
. C.
1
1V
a
. D.
1
1V
a
.
Lời giải
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Câu 69.(Sở GD & ĐT Cần Thơ 2018) Goi
H
là hình phẳng giới hạn bởi đồ thị hàm số
x
ye
, trục
Ox
và hai đường thẳng
0,x
1x
. Thể tích của khối tròn xoay tạo thành khi quay
H
xung
quanh trục
Ox
là
A.
2
1
2
e
. B.
2
1e
. C.
2
1
2
e
. D.
2
1e
.
Lời giải
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Câu 70.(THPT Chuyên Nguyễn Quang Diệu 2018) Cho hình phẳng
H
giới hạn bởi các đường
1yx
, trục hoành và đường thẳng
4x
. Khối tròn xoay tạo thành khi quay
H
quanh trục
hoành có thể tích
V
bằng bao nhiêu?
A.
7
6
V
. B.
2
7π
6
V
. C.
7π
6
V
. D.
7π
3
V
.
Lời giải
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Câu 71.(TT Diệu Hiền 2018) Cho hình
H
giới hạn bởi các đường
2
2y x x
, trục hoành. Quay
hình phẳng
H
quanh trục
Ox
ta được khối tròn xoay có thể tích là:
A.
496
15
. B.
32
15
. C.
4
3
. D.
16
15
.
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Lời giải
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Câu 72.(THPT Chuyên Thái Bình 2018) Thể tích của vật tròn xoay có được khi quay hình phẳng
giới hạn bởi đồ thị hàm
tanyx
, trục
Ox
, đường thẳng
0x
, đường thẳng
3
x
quanh trục
Ox
là
A.
3
3
V
. B.
3
3
V
. C.
2
3
3
V
.D.
2
3
3
V
.
Lời giải
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Câu 73.(Sở GD & ĐT Phú Thọ) Gọi
H
là hình phẳng giới hạn bởi đồ thị hàm số
2
43y x x
,
trục hoành và hai đường thẳng
1; 3xx
. Thể tích khối tròn xoay tạo thành khi quay
D
quanh
trục hoành bằng
A.
16
15
. B.
16
15
. C.
4
3
. D.
4
3
.
Lời giải
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Câu 74.(THPT Tây Thụy Anh 2018)Tính thể tích của phần vật thể tạo nên khi quay quanh trục
Ox
hình phẳng
D
giới hạn bởi đồ thị
2
:2P y x x
và trục
Ox
bằng
A.
19
15
V
. B.
13
15
V
. C.
17
15
V
. D.
16
15
V
.
Lời giải
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Câu 75.(Đề Chính Thức 2018) Cho hình phẳng
H
giới hạn bởi các đường
2
3yx
,
0y
,
0x
,
2x
. Gọi
V
là thể tích của khối tròn xoay được tạo thành khi quay
H
xung quanh trục
Ox
. Mệnh đề nào dưới đây đúng?
A.
2
2
2
0
3V x dx
. B.
2
2
0
3V x dx
. C.
2
2
2
0
3V x dx
. D.
2
2
0
3V x dx
.
Lời giải
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Câu 76.(THTT số 6 - 2018) Cho hình phẳng
H
giới hạn bởi các đường cong
ln x
y
x
, trục hoành
và đường thẳng
ex
. Khối tròn xoay tạo thành khi quay
H
quanh trục hoành có thể tích
V
bằng bao nhiêu?
A.
2
V
. B.
3
V
. C.
6
V
. D.
V
.
Lời giải
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Mức độ 2. Thông hiểu
Câu 77.(THPT Hậu Lộc 2-2018) Tính thể tích khối tròn xoay được tạo thành khi quay hình phẳng
giới hạn bởi đồ thị hàm số
2
3y x x
và trục hoành, quanh trục hoành.
A.
81
10
. B.
85
10
. C.
41
7
. D.
8
7
.
Lời giải
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Câu 78.(THPT Chuyên Lê Hồng Phong 2019) Cho hình phẳng
D
giới hạn bởi cac đường cong
2 cosyx
, trục hoành và các đường thẳng
0x
,
2
x
. Khối tròn xoay tạo thành khi quay
D
quanh trục hoành có thể tích
V
bằng bao nhiêu?
A.
1V
. B.
1V
. C.
1V
. D.
1V
.
Lời giải
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Câu 79.(Sở GD & ĐT Nam Định 2019) Cho hình phẳng
D
giới hạn bởi đường cong
2 sinyx
,
trục hoành và các đường thẳng
0,xx
. Khối tròn xoay tạo thành khi quay
D
quanh trục
hoành có thể tích
V
bằng bao nhiêu ?
A.
21V
. B.
21V
. C.
2
2V
. D.
2V
.
Lời giải
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Câu 80.(THPT Chuyên Hoàng Văn Thụ 2018) Thể tích của khối tròn xoay
D
thu được khi quay
quanh trục
Ox
hình phẳng giới hạn bởi đồ thị hàm số
e
x
yx
, trục hoành và đường thẳng
1x
A.
2
e1
4
. B.
2
1
e1
4
. C.
4
e1
4
. D.
4
1
e1
4
.
Lời giải
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Câu 81.(THTT số 6-489 tháng 3) Cho hình phẳng
H
giới hạn bởi các đường cong
ln x
y
x
, trục
hoành và đường thẳng
ex
. Khối tròn xoay tạo thành khi quay
H
quanh trục hoành có thể
tích
V
bằng bao nhiêu?
A.
2
V
. B.
3
V
. C.
6
V
. D.
V
.
Lời giải
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Câu 82.(Sở GD & ĐT Bắc Ninh 2018)Cho hình phẳng
D
giới hạn bởi đồ thị
2 1 lny x x
, trục
hoành và đường thẳng
ex
. Khi hình phẳng
D
quay quanh trục hoành được vật thể tròn xoay
có thể tích
V
được tính theo công thức
A.
e
2
1
2 1 ln dV x x x
. B.
e
2
1
2
2 1 ln dV x x x
.
C.
e
2
1
2
2 1 ln dV x x x
. D.
e
2
1
2 1 ln dV x x x
.
Lời giải
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Câu 83.(Sở GD & ĐT Cần Thơ 2018)Thể tích của khối tròn xoay tạo thành khi quay hình phẳng
giới hạn bởi đồ thị hàm số
tanyx
, trục hoành và các đường thẳng
0x
,
π
4
x
quanh trục
hoành là
A.
π
4
V
. B.
π ln 2
2
V
. C.
2
π
4
V
. D.
π
4
V
.
Lời giải
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Câu 84.(THPT Chuyên Phan Bội Châu 2018)
Cho hình phẳng
H
giới hạn bởi các đường
ln 2 1yx
,
0y
,
0x
,
1x
. Tính thể tích của
khối tròn xoay tạo thành khi quay hình
H
quanh trục
Ox
.
A.
2
ln3 1
3
. B.
ln3
2
. C.
1
ln3 1
2
. D.
3
ln3
2
.
Lời giải
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Câu 85.(THPT Chuyên Thái Bình 2018)
Thể tích của vật tròn xoay khi quay hình phẳng giới hạn bởi đồ thị hàm
tanyx
, trục
Ox
, đường
thẳng
0x
, đường thẳng
3
x
quanh trục
Ox
là:
A.
3
3
V
. B.
3
3
V
. C.
2
3
3
V
. D.
2
3
3
V
.
Lời giải
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Câu 86.
(THPT Nguyễn Du 2019)
Tính thể tích V của khối tròn xoay tạo thành khi quay hình phẳng
giới hạn bởi các đường
tan , 0, 0,
4
y x y x x
xung quanh trục
.Ox
A.
ln 2
4
V
. B.
ln 2V
. C.
2
4
V
. D.
ln 2V
.
Lời giải
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Câu 87.(THPT Chuyên Ngoại Ngữ Hà Nội) Gọi
H
là hình phẳng giới hạn bởi đường
2
4yx
,
trục
Ox
và đường
3x
. Tính thể tích khối tròn xoay tạo thành khi quay hình phẳng
H
quanh
trục hoành.
A.
3V
. B.
7
3
V
. C.
5
3
V
. D.
2.V
Lời giải
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Câu 88.(Toán Học Tuổi Trẻ 2018) Cho hình phẳng
H
giới hạn bởi các đường cong
ln x
y
x
, trục
hoành và đường thẳng
ex
. Khối tròn xoay tạo thành khi quay
H
quanh trục hoành có thể
tích
V
bằng bao nhiêu?
A.
2
V
. B.
3
V
. C.
6
V
. D.
V
.
Lời giải
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Câu 89.(Sở GD & ĐT Vĩnh Phúc 2019) Thể tích
V
của khối tròn xoay được sinh ra khi quay hình
phẳng giới hạn bởi đường tròn
2
2
: 3 1C x y
xung quanh trục hoành là
A.
2
6
. B.
3
6
. C.
2
3
. D.
6
.
Lời giải
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Mức độ 3. Vận dụng
Câu 90.(Sở GD & ĐT Bình Thuận 2018)
Xét hình phẳng
H
giới hạn bởi đồ thị hàm số
sin cosf x a x b x
(với
a
,
b
là các hằng số
thực dương), trục hoành, trục tung và đường thăng
x
. Nếu vật thể tròn xoay được tạo thành
khi quay
H
quanh trục
Ox
có thể tích bằng
2
5
2
và
02f
thì
25ab
bằng
A.
8
. B.
11
. C.
9
. D.
10
.
Lời giải
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Câu 91.(Học Sinh giỏi Bắc Ninh) Cho hình phẳng
()H
được giới hạn bởi đường cong
22
y m x
(
m
là tham số khác
0
) và trục hoành. Khi
()H
quay xung quanh trục hoành được khối tròn xoay
có thể tích
V
. Có bao nhiêu giá trị nguyên của
m
để
1000V
.
A. 18. B. 20. C. 19. D. 21.
Lời giải
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Câu 92.(THPT Quỳnh Lưu 2018) Thể tích
V
của khối tròn xoay được sinh ra khi quay hình phẳng
giới hạn bởi đường tròn
2
2
: 3 1C x y
xung quanh trục hoành là
A.
6V
.
B.
3
6V
.
C.
2
3V
.
D.
2
6V
.
Lời giải
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Câu 93.(Kênh Truyền Hình Giáo Dục Quốc Gia 2019) Cho hình phẳng
D
giới hạn bởi đường cong
32
1
x
x
xe
y
xe
, trục hoành và hai đường thẳng
0x
,
1x
. Khối tròn xoay tạo thành khi quay
D
quanh trục hoành có thể tích
1
ln 1V a b
e
, trong đó
a
,
b
là các số hữu tỷ.
Mệnh đề nào dưới đây đúng?
A.
25ab
. B.
3ab
. C.
27ab
. D.
5ab
.
Lời giải
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Câu 94.(THPT Chuyên Thái Nguyên 2019)
Tính thể tích
V
của khối tròn xoay tạo thành khi quay hình tròn
22
: 2 3 1C x y
quanh
trục
Ox
.
A.
2
2V
. B.
2
6V
. C.
2
V
. D.
6V
.
Lời giải
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DẠNG 6. Tính thể tích vật thể giới hạn bởi hai đồ thị hàm số
, , ,y f x y g x x a x b
khi
quay quanh trục hoành
1. Phương pháp.
Để tính thể tích vật thể giới hạn bởi
1
2
( ): ( )
( ):
( ):
C y f x
C y g x
H
xa
xb
ta tiến
hành hai bước:
Bước : Áp dụng công thức diện tích cần tính là
22
d
b
a
V f x g x x
Bước : Tính tích phân.
2. Bài tập minh họa.
Bài tập 24. Cho hình phẳng
H
giới hạn bởi các đường
yx
,
yx
và
4x
. Tính thể tích
của khối tròn xoay tạo thành khi quay hình
H
quanh trục hoành.
Lời giải
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3. Câu hỏi trắc nghiệm.
Mức độ 1. Nhận biết
Câu 95.(THPT Nguyễn Trãi-Đà Nẵng 2018) Cho hình phẳng trong
hình (phần tô đậm) quay quanh trục hoành. Thể tích của khối
tròn xoay tạo thành được tính theo công thức nào?
A.
22
12
d
b
a
V f x f x x
. B.
22
12
d
b
a
V f x f x x
.
C.
22
21
d
b
a
V f x f x x
. D.
2
12
d
b
a
V f x f x x
.
Lời giải
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Câu 96.(TT Diệu Hiền-Cần Thơ 2018) Cho hình phẳng
H
giới hạn bởi các đường
2
yx
,
2yx
.
Thể tích của khối tròn xoay được tạo thành khi quay
H
xung quanh trục
Ox
bằng:
A.
32
15
. B.
64
15
. C.
21
15
. D.
16
15
.
Lời giải
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Câu 97.(THPT Chuyên Trần Phú 2018) Thể tích vật thể tròn xoay sinh ra khi hình phẳng giới hạn
bởi các đường
xy
,
2yx
và
0x
quay quanh trục
Ox
có giá trị là kết quả nào sau đây?
A.
1
3
V
. B.
3
2
V
. C.
32
15
V
. D.
11
6
V
.
Lời giải
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Câu 98.(Sở GD & ĐT Quảng Nam 2018) Gọi
H
là hình phẳng giới hạn bởi
2
:P y x
và đường
thẳng
2yx
. Tính thể tích khối tròn xoay tạo thành khi quay hình
H
xung quanh trục
Ox
.
A.
64
15
. B.
16
15
. C.
20
3
. D.
4
3
.
Lời giải
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Câu 99.(THPT Kim Liên 2018)Cho hình phẳng
H
(phần gạch
chéo trong hình vẽ). Tính thể tích
V
của khối tròn xoay tạo thành
khi quay hình
H
quanh trục hoành.
A.
8V
. B.
10V
. C.
8
3
V
. D.
16
3
V
.
Lời giải
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Câu 100.(THTT Số 3-486-2018) Cho hình phẳng
D
giới hạn bởi đường cong
1
e
x
y
, các trục tọa
độ và phần đường thẳng
2yx
với
1x
. Tính thể tích khối tròn xoay tạo thành khi quay
quanh trục hoành.
A.
2
2
1 e 1
3 2e
V
. B.
2
2
5e 3
6e
V
. C.
1 e 1
2e
V
. D.
2
2
1 e 1
2 2e
V
.
Lời giải
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Câu 101.(THPT Kim Liên 2019) Cho hình phẳng (
H
)
(phần gạch chéo trong hình vẽ). Thể tích khối tròn
xoay khi hình (
H
) quay xung quanh
Ox
được tính
theo công thức nào dưới đây?
A.
11
4 2 4
11
( 4 4)x x dx x dx
.
B.
11
4 2 4
11
( 4 4)x x dx x dx
.
C.
1
42
1
(4 8 4)x x dx
.
D.
11
4 4 2
11
( 4 4)x dx x x dx
.
Lời giải
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Câu 102.(THPT Thăng Long 2019) Tính thể tích vật thể tròn xoay tạo thành khi cho hình phẳng
giới hạn bởi đường elip có phương trình:
22
1
94
xy
quay xung quanh trục
Ox
.
A.
8
. B.
12
. C.
16
. D.
6
.
Lời giải
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Câu 103.(THPT Thanh Chương Nghệ An) Thể tích vật thể tròn
xoay sinh bởi hình phẳng giới hạn bởi các đường
2
yx
,
2yx
khi quay quanh trục
Ox
được tính theo công thức nào dưới đây ?
A.
2
42
0
4dx x x
. B.
2
2
0
2dx x x
.
C.
2
24
0
4dx x x
. D.
2
24
0
4dx x x
.
Lời giải
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Câu 104.(THPT Lý Nhân Tông 2019) Cho hình phẳng
D
giới hạn bởi đường cong
lnyx
, trục
hoành và đường thẳng
xe
. Tính thể tích
V
của khối tròn xoay tạo thành khi quay
D
quanh
.Ox
A.
1Ve
. B.
2Ve
. C.
Ve
. D.
1Ve
.
Lời giải
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Câu 105.(THPT Kim Liên 2017) Gọi
H
là hình phẳng giới hạn bởi các đường
2
2
1e
xx
yx
;
0y
;
2x
. Tính thể tích
V
của khối tròn xoay khi quay hình
H
xung quanh trục hoành.
A.
2e 1
2e
V
. B.
2e 3
2e
V
. C.
e1
2e
V
. D.
e3
2e
V
.
Lời giải
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Mức độ 2. Thông hiểu
Câu 106.(THPT Chuyên Biên Hòa2018) Tính thể tích
V
của vật tròn xoay tạo thành khi quay hình
phẳng
H
giới hạn bởi các đường
2
yx
;
yx
quanh trục
Ox
.
A.
9
10
V
. B.
3
10
V
. C.
10
V
. D.
7
10
V
.
Lời giải
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Câu 107.(THPT Chuyên Vĩnh Phúc 2018) Tính thể tích của khối tròn xoay khi quay hình phẳng
giới hạn bởi các đường
2
4yx
,
24yx
,
0x
,
2x
quanh trục
.Ox
A.
32π
5
. B.
32π
7
. C.
32π
15
. D.
22π
5
.
Lời giải
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Câu 108.(THPT Chuyên Hùng Vương 2018) Tính thể tích khối tròn xoay sinh ra khi quay quanh
trục
Ox
hình phẳng giới hạn bởi hai đồ thị
2
46y x x
và
2
26y x x
.
A.
3
. B.
1
. C.
. D.
2
.
Lời giải
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Câu 109.(Sở GD & ĐT Đồng Tháp 2018) Cho hình phẳng
D
giới hạn bởi đồ thị các hàm số
2
2
x
y
,
2yx
. Khối tròn xoay tạo thành khi quay
D
quanh trục hoành có thể tích
V
bằng bao nhiêu?
A.
28
5
V
. B.
12
5
V
. C.
4
3
V
. D.
36
35
V
.
Lời giải
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Câu 110.(THPT Trần Phú 2018) Gọi
H
là hình được giới hạn bởi nhánh parabol
2
2yx
(với
0x
), đường thẳng
3yx
và trục hoành. Thể tích của khối tròn xoay tạo bởi hình
H
khi
quay quanh trục
Ox
bằng
A.
52
15
V
. B.
17
5
V
. C.
51
17
V
. D.
53
17
V
.
Lời giải
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Câu 111.(Tạp Chí Toán Học Số 2-2018) Cho hình
H
giới hạn bởi
trục hoành, đồ thị của một Parabol và một đường thẳng tiếp xúc
với Parabol đó tại điểm
2;4A
, như hình vẽ bên. Thể tích vật thể
tròn xoay tạo bởi khi hình
H
quay quanh trục
Ox
bằng
A.
16
15
. B.
32
5
. C.
2
3
. D.
22
5
.
Lời giải
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Câu 112.(THPT Chuyên Hà Tĩnh 2018) Thể tích khối tròn xoay do hình phẳng giới hạn bởi các
đường
20xy
;
yx
;
0y
quay quanh trục
Ox
bằng
A.
5
6
. B.
6
5
. C.
2
3
. D.
5
6
.
Lời giải
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Câu 113.(THPT Chuyên Thái Bình 2018)Tính thể tích vật thể tròn xoay tạo bởi phép quay xung
quanh trục
Ox
hình phẳng giới hạn bởi các đường
0y
,
yx
,
2yx
.
A.
8
3
. B.
16
3
. C.
10
. D.
8
.
Lời giải
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Câu 114.(THPT NewTon 2018) Gọi
()H
là hình phẳng được giới hạn
bởi các đồ thị hàm số
1
2 , , 0
x
y x y y
x
(phần tô đậm màu đen
ở hình vẽ bên). Thể tích của vật thể tròn xoay tạo thành khi quay
()H
quanh trục hoành bằng.
A.
5
2ln 2
3
V
. B.
5
2ln 2
3
V
. C.
2
2ln 2
3
V
. D.
2
2ln 2
3
V
.
Lời giải
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Câu 115.(THPT Chuyên Lương Thế Vinh 2018) Gọi
D
là hình
phẳng giới hạn bởi đồ thị hàm số
yx
, cung tròn có phương
trình
2
6yx
66x
và trục hoành
Ox
(phần tô
đậm trong hình vẽ bên). Tính thể tích
V
của vật thể tròn xoay
sinh bởi khi quay hình phẳng
D
quanh trục
Ox
.
A.
8 6 2V
. B.
22
86
3
V
.
C.
22
86
3
V
. D.
22
46
3
V
.
Lời giải
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Câu 116.(Tạp chí Toán Học 2019) Trong mặt phẳng tọa độ
Oxy
, gọi
12
,HH
là các hình phẳng
2
2
1
4
:
4
4, 4
x
y
x
Hy
xx
và
22
2
2
2
2
2
16
: 2 4
24
xy
H x y
xy
. Cho
12
,HH
xoay quanh trục
Oy
ta được các
vật thể có thể tích lần lượt
12
,VV
. Đẳng thức nào sau đây đúng.
A.
12
VV
. B.
12
1
2
VV
. C.
12
2VV
. D.
12
3
2
VV
.
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Câu 117.(THPT Chuyên Hạ Long 2019) Cho hình phẳng
H
giới hạn bởi
22
:1
25 9
xy
E
và
đường tròn
22
:9C x y
(phần nằm trong
E
và nằm ngoài
C
. Tính thể tích khối tròn xoay
sinh bởi
H
khi quay quanh trục
Ox
.
A.
24
5
. B.
8
5
. C.
24
25
. D.
24
.
Lời giải
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Câu 118.(THPT Kinh Môn 2018)
Cho hai đường tròn và cắt nhau tại hai điểm ,
B
sao cho là một đường kính của đường tròn . Gọi
là hình phẳng được giới hạn bởi hai đường tròn (ở ngoài đường
tròn lớn, phần được gạch chéo như hình vẽ). Quay quanh
trục ta được một khối tròn xoay. Tính thể tích của khối
tròn xoay được tạo thành.
A. . B. C. . D. .
Lời giải
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1
;5O
2
;3O
A
AB
2
;3O
D
D
12
OO
V
36V
68
3
V
14
3
V
40
3
V
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Câu 119.(THPT Thị Xã Quảng Trị 2019) Cho đồ thị
32
:C y ax bx cx d
và Parabol
2
:P y mx nx p
có đồ thị như hình vẽ (đồ thị
C
là đường cong đậm hơn).
Biết phần hình phẳng được giới hạn bởi
C
và
P
(phần
tô đậm) có diện tích bằng
1
. Thể tích của khối tròn xoay tạo
thành khi quay phần hình phẳng đó quanh trục hoành bằng
A.
3
. B.
237
35
. C.
5
. D.
159
35
.
Lời giải
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Câu 120.(THPT Lương Thế Vinh 2019) Cho hình vuông
OABC
có cạnh bằng
4
được chia thành hai phần bởi
parabol
P
có đỉnh tại
O
. Gọi
S
là hình phẳng không bị
gạch (như hình vẽ). Tính thể tích
V
của khối tròn xoay khi
cho phần
S
quay quanh trục
Ox
.
A.
128
5
V
. B.
128
3
V
. C.
64
5
V
. D.
256
5
V
.
Lời giải
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Câu 121.(Gang Thép Thái Nguyên) Gọi
V
là thể tích khối
tròn xoay tạo thành khi quay hình phẳng giới hạn bởi các
đường
yx
,
0y
và
4x
quanh trục
Ox
. Đường thẳng
04x a a
cắt đồ thị hàm số
yx
tại
M
(hình vẽ).
Gọi
1
V
là thể tích khối tròn xoay tạo thành khi quay tam giác
OMH
quanh trục
Ox
. Biết rằng
1
2VV
. Khi đó
A.
2a
. B.
22a
. C.
5
2
a
. D.
3a
.
Lời giải
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Câu 122.(THPT Chuyên Lý Tự Trọng 2019) Gọi
D
là hình phẳng được giới hạn bởi các đường
thẳng
3 10, 1y x y
và Parabol
2
,0yx x
. Tính thể tích
V
của khối tròn xoay quay
D
quanh trục
Ox
tạo nên, (
D
nằm ngoài parabol
2
yx
).
A.
56
5
V
. B.
56
5
V
. C.
56
5
V
. D.
56
15
V
.
Lời giải
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DẠNG 7. Tính thể tích vật thể giới hạn bởi hai đồ thị hàm số
, , ,x f y x g y y a y b
khi
quay quanh trục tung
Oy
.
1. Phương pháp.
Để tính thể tích vật thể giới hạn bởi
1
2
( ): ( )
( ): ( ):
;
C x f y
H C x g y
y a y b
ta tiến hành hai bước:
Bước : Áp dụng công thức diện tích cần tính là
22
dy
b
a
V f y g y
Bước : Tính tích phân.
2. Bài tập minh họa.
Bài tập 25. Cho hình phẳng
H
giới hạn bởi các đường
1yx
và hai đường
4x
,
0y
.
Tính thể tích của khối tròn xoay tạo thành khi quay hình
H
a). Quanh trục
Ox
. b). Quanh trục
Oy
.
Lời giải
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Bài tập 26. Cho hình phẳng
H
giới hạn bởi các đường
2
2y x x
và
0y
. Tính thể tích
của khối tròn xoay tạo thành khi quay hình
H
a). Quanh trục
Ox
. b). Quanh trục
Oy
.
Lời giải
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3. Câu hỏi trắc nghiệm.
Câu 123.(Tạp chí THTT 2018) Hình phẳng giới hạn bởi hai đồ
thị
yx
và
2
yx
quay quanh trục tung tạo nên một vật
thể tròn xoay có thể tích bằng
A.
6
. B.
3
. C.
2
15
. D.
4
15
.
Lời giải
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Câu 124.(THPT Chuyên Hùng Vương 2018) Cho hình phẳng
H
giới hạn bởi các đường
4xy
,
0x
,
1y
và
4y
. Tính thể tích
V
của khối tròn xoay khi quay hình
H
quanh
.Oy
A.
8πV
. B.
16πV
. C.
10πV
. D.
12πV
.
Lời giải
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DẠNG 8. Ứng dụng trong thực tế tính vận tốc, quãng đường, diện tích và thể tích vật thể .
1. Phương pháp.
Ta tìm quãng đường, vận tốc và gia tốc dựa vào sơ
đồ sau:
Để tính diện tích, thể tích các hình phẳng và khối
vật thể trong thực tế ta thường tiến hành các
bước sau:
Bước 1. Chọn hệ trục tọa độ cho phù hợp.
Bước 2. Dựa vào đồ thị thiết lập hệ phương trình để
tìm hàm số.
Bước 3. Áp dụng công thức tính diện tích và thể tích.
Thể tích
V
của vật thể
H
với
Sx
là thiết diện
của
H
cắt bởi mặt phẳng vuông góc với trục
Ox
cho
được tính bởi công thức
d
b
a
V S x x
2. Câu hỏi trắc nghiệm.
Câu 125.(THPT Nguyễn Quang Diêu) Trong không gian với hệ tọa độ
Oxyz
, cho vật thể
H
giới
hạn bởi hai mặt phẳng có phương trình
xa
,
x b a b
. Gọi
Sx
là thiết diện của
H
cắt
bởi mặt phẳng vuông góc với trục
Ox
tại điểm có hoành độ là
x
với
a x b
. Giả sử hàm số
y S x
liên tục trên đoạn
;ab
. Khi đó thể tích
V
của vật thể
H
được cho bởi công thức
A.
2
d
b
a
V S x x
. B.
d
b
a
V S x x
. C.
2
d
b
a
V S x x
. D.
d
b
a
V S x x
.
Lời giải
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Câu 126.(THPT Thanh Chương 2019) Cho phần vật thế
được giới hạn bởi hai mặt phẳng
P
và
Q
vuông góc với trục
Ox
tại
0x
,
3x
. Cắt phần vật thể
bởi mặt phẳng vuông góc với
trục
Ox
tại điểm có hoành độ bằng
x
03x
ta được thiết diện là hình chữ nhật có kích
thước lần lượt là
x
và
3 x
. Thể tích phần vật thể
bằng
A.
27
4
. B.
12 3
5
. C.
12 3
5
. D.
27
4
.
Lời giải
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Câu 127.(THPT Kim Liên 2018) Trong không gian với hệ tọa độ
Oxyz
, cho vật thể nằm giữa hai
mặt phẳng
0x
và
3x
. Biết rằng thiết diện của vật thể cắt bởi mặt phẳng vuông góc với trục
Ox
tại điểm có hoành độ
03xx
là một hình vuông cạnh là
2
9 x
. Thể tích
V
của vật thể.
A.
171V
B.
171V
. C.
18V
. D.
18V
.
Lời giải
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Câu 128.(Đặng Thành Nam) Tính thể tích vật thể giới hạn bởi các mặt phẳng
0x
và
1x
, biết
thiết diện của vật thể khi cắt bởi mặt phẳng vuông góc với trục
Ox
tại điểm có hoành độ
x
(0 1)x
là một hình vuông có độ dài cạnh
1
x
xe
.
A.
2
V
. B.
1
2
e
V
. C.
1
2
V
. D.
( 1)
2
e
V
.
Lời giải
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Câu 129.(THPT Chuyên Lê Hồng Phong 2019) Tính thể tích của vật thể nằm giữa hai mặt phẳng
1x
và
1x
, biết rằng thiết diện của vật thể bị cắt bởi mặt phẳng vuông góc với trục
Ox
tại
điểm có hoành độ
11xx
là một tam giác vuông cân có cạnh huyền bằng
4
1 x
.
A.
3
4
. B.
2
5
. C.
4
. D.
1
4
.
Lời giải
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Câu 130.(Tạp Chí Toán Học 2019) Cắt một vật thể
V
bởi hai mặt phẳng song song
P
,
Q
lần
lượt vuông góc với trục
Ox
tại
2
x
,
2
x
. Một mặt tùy ý vuông góc với trục
Ox
tại điểm
x
22
x
cắt
V
theo thiết diện có diện tích là
2
1S x sin x cosx
. Tính thể tích vật thể
V
giới hạn bởi hai mặt phẳng
P
,
Q
.
A.
3,14
. B.
8
3
. C.
13
6
. D.
8
3
.
Lời giải
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Câu 131.(Chuyên Đại Học Vinh 2019) Tính thể tích của vật thể giới hạn bởi hai mặt phẳng
và , biết rằng khi cắt bởi mặt phẳng tùy ý vuông góc với trục
tại điểm có hoành độ
04xx
thì được thiết diện là nửa hình tròn có bán kính .
A. . B. . C. . D. .
Lời giải
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Câu 132.(THPT Kim Liên 2017) Một xe lửa chuyển động chậm dần đều và dừng lại hẳn sau
20
s
kể từ lúc bắt đầu hãm phanh. Trong thời gian đó xe chạy được
120
m. Cho biết công thức tính vận
tốc của chuyển động biến đổi đều là
0
v v at
; trong đó
a
(
2
m/s
) là gia tốc,
v
(m/s) là vận tốc
tại thời điểm
t
(s). Hãy tính vận tốc
0
v
của xe lửa lúc bắt đầu hãm phanh.
A.
30
m/s. B.
6
m/s. C.
12
m/s. D.
45
m/s.
Lời giải
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Câu 133.(Chuyên KHTN Hà Nội 2019) Một bác thợ xây bơm nước vào bể chứa nước. Gọi
Vt
là
thể tích nước bơm được sau
t
giây. Biết rằng
2
V t at bt
và ban đầu bể không có nước, sau
5
giây thể tích nước trong bể là
3
15m
, sau
10
giây thì thể tích nước trong bể là
3
110m
. Thể tích
nước bơm được sau
20
giây bằng
A.
3
60 .m
B.
3
220 .m
C.
3
840 .m
D.
3
420 .m
Lời giải
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0x
4x
Ox
4R x x
64
3
V
32
3
V
64
3
V
32
3
V
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Câu 134.(Đặng Thành Nam) Trên đoạn thẳng
AB
dài
200
mét có hai chất điểm
X
và
Y
. Chất điểm
X
xuất phát từ
A
chuyển động thẳng hướng đến
B
với vận tốc biến thiên theo thời gian bởi quy
luật
2
11
( ) ( / ),
80 3
v t t t m s
trong đó
t
(giây) tính từ lúc
X
bắt đầu chuyển động. Từ trạng thái
nghỉ, chất điểm
Y
xuất phát từ
B
và xuất phát chậm hơn
10X
giây và chuyển động thẳng ngược
chiều với
X
có gia tốc bằng
2
( / )a m s
với
a
là hằng số. Biết rằng hai chất điểm gặp nhau tại đúng
trung điểm của đoạn thẳng
AB
, giá trị của
a
bằng
A.
2.
B.
1,5.
C.
2,5.
D.
1.
Lời giải
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Câu 135.(THPT Cầu Giấy Hà Nội 2019) Trong một chuyển động thẳng, một ô tô đang chạy với vận
tốc
15
m/s thì người lái hãm phanh. Sau khi hãm phanh, ô tô chuyển động chậm dần đều với vận
tốc
5 15v t t
(m/s) trong đó
t
là khoảng thời gian tính bằng giây kể từ lúc bắt đầu hãm
phanh. Hỏi từ lúc hãm phanh đến khi dừng hẳn, ô tô còn di chuyển bao nhiêu mét?
A.
23,5
m. B.
22
m. C.
22,5
m. D.
21,5
m.
Lời giải
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Câu 136.(THPT Đoàn Thượng 2019) Một ô tô đang chuyển động đều với vận tốc
15 /ms
thì phía
trước xuất hiện trước ngại vật nên người lái xe đạp phanh gấp. Kể từ điểm đó, ô tô chuyển động
chậm dần đều với gia tốc
a
2
/ms
,
0a
. Biết ô tô chuyển động được
20m
nửa thì dừng hẳn.
Hỏi
a
thuộc khoảng nào dưới đây ?
A.
6;7
. B.
4;5
. C.
5;6
. D.
3;4
.
Lời giải
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Câu 137.(Đặng Thành Nam 2019) Để đảm bảo an toàn khi khi lưu thông trên đường, các xe ô tô
khi dừng đèn đỏ phải cách nhau tối thiểu
1 m
. Ô tô A đang chạy với vận tốc
16 m/s
bỗng gặp ô tô
B đang dừng đèn đỏ phía trước nên ô tô A đạp phanh (đạp thắng) và chuyển động chậm dần đều
với vận tốc
16 4 m/sv t t
, trong đó
t
là khoảng thời gian tính bằng giây kể từ thời điểm ô tô
A bắt đầu đạp phanh. Hỏi để hai ô tô A và B khi dừng lại đạt khoảng cách an toàn thì ô tô A phải
đạp phanh khi cách ô tô B một khoảng tối thiểu là bao nhiêu mét?
A.
33 m
. B.
32 m
. C.
31 m
. D.
34 m
.
Lời giải
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Câu 138.(THPT Kim Liên 2018) Cửa lớn của một trung tâm giải trí
có dạng hình Parabol ( như hình vẽ ). Người ta dự định lắp cửa
bằng cường lực 12 ly với đơn giá 800.000( đồng/
2
m
). Tính chi phí
để lắp cửa.
A. 9.6.00.000 đồng. B. 19.200.000 đồng.
C. 33.600.000 đồng. D. 7.200.000 đồng.
Lời giải
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Câu 139.(Sở GD & ĐT Thanh Hóa 2019) Một khuôn viên
dạng nửa hình tròn, trên đó người ta thiết kế phần để
trồng hoa có dạng của một cánh hoa hình parabol có đỉnh
trùng với tâm và có trục đối xứng vuông góc với đường
kính của nửa hình tròn, hai đầu mút của cánh hoa nằm
trên nửa hình tròn (phần tô đậm) và cách nhau một
khoảng 4 (m). Phần còn lại của khuôn viên (phần không
tô đậm) dành để trồng cỏ Nhật Bản. Biết các kích thước như hình vẽ, chi phí để trồng hoa và cỏ
Nhật Bản tương ứng là 150.000 đồng/m2 và 100.000 đồng/m2. Hỏi cần bao nhiêu tiền để trồng
hoa và cỏ Nhật Bản trong khuôn viên đó? (Số tiền được làm tròn đến hàng đơn vị)
A. 3.926.990 (đồng) . B. 4.115.408 (đồng). C. 1.948.000 (đồng). D. 3.738.574 (đồng).
Lời giải
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Câu 140.(Đặng Thành Nam) Một thùng đựng bia hơi (có dạng khối
tròn xoay như hình vẽ) có đường kính đáy là
30cm
, đường kính
lớn nhất của thân thùng là
60cm
, các cạnh bên hông của thùng có
hình dạng của một parabol. Thể tích của thùng bia hơi gần nhất
với kết quả nào dưới đây? (giả sử độ dày của thùng bia không
đáng kể)
A.
70
(lít). B.
62
(lít). C.
60
(lít). D.
64
(lít).
Lời giải
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Câu 141.(THPT Nguyễn Công Trứ 2019) Ông An muốn làm
cửa rào sắt có hình dạng và kích thước như hình vẽ bên, biết
đường cong phía trên là một Parabol. Giá
2
1m
của rào sắt là
700.000
đồng. Hỏi ông An phải trả bao nhiêu tiền để làm cái
cửa sắt như vậy (làm tròn đến hàng nghìn).
A.
6.620.000
đồng. B.
6.320.000
đồng.
C.
6.520.000
đồng. D.
6.417.000
đồng.
Lời giải
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Câu 142.(THPT Chuyên Hưng Yên) Để chuẩn bị cho hội trại do
Đoàn trường tổ chức, lớp 12A dự định dựng một cái lều trại có
hình parabol như hình vẽ. Nền của lều trại là một hình chữ nhật
có kích thước bề ngang
3
mét, chiều dài
6
mét, đỉnh trại cách
nền
3
mét. Tính thể tích phần không gian bên trong trại.
A.
3
72 m
. B.
3
36 m
. C.
3
72 m
. D.
3
36 m
.
Lời giải
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Câu 143.(THPT Kinh Dương 2019) Một chiếc đồng hồ cát như hình vẽ,
gồm hai phần đối xứng nhau qua mặt nằm ngang và đặt trong một hình
trụ. Thiết diện thẳng đứng qua trục của nó là hai parabol chung đỉnh và
đối xứng nhau qua mặt nằm ngang. Ban đầu lượng cát dồn hết ở phần
trên của đồng hồ thì chiều cao
h
của mực cát bằng
3
4
chiều cao của bên
đó (xem hình). Cát chảy từ trên xuống dưới với lưu lượng không đổi
3
12,72cm
/phút. Khi chiều cao của cát còn
4cm
thì bề mặt trên cùng của
cát tạo thành một đường tròn có chu vi
8 cm
(xem hình). Biết sau 10
phút thì cát chảy hết xuống phần bên dưới của đồng hồ. Hỏi chiều cao
của khối trụ bên ngoài là bao nhiêu
cm
?
A.
10cm
. B.
9cm
. C.
8cm
. D.
12cm
.
Lời giải
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Câu 144.(THPT Cẩm Giàng)Trong chương trình nông
thôn mới, tại một xã Y có xây một cây cầu bằng bê tông
như hình vẽ. Tính thể tích khối bê tông để đổ đủ cây
cầu. (Đường cong trong hình vẽ là các đường Parabol).
A.
3
19m
. B.
3
21m
. C.
3
18m
. D.
3
40m
.
Lời giải
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Câu 145. Một bác thợ xây bơm nước vào bể chứa nước. Gọi
ht
là thể tích nước bơm được sau
t
giây. Cho
2
'3h t at bt
và ban đầu bể không có nước. Sau 5 giây thì thể tích nước trong bể là
3
150m
, sau 10 giây thì thể tích nước trong bể là
3
1100m
. Tính thể tích của nước trong bể sau khi
bơm được
20
giây.
A.
3
8400m
. B.
3
4200m
.
C.
3
600m
. D.
3
2200m
.
Lời giải
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Câu 146.(THPT Hàm Rồng 2019) Một hoa văn trang trí được tạo
ra từ một miếng bìa mỏng hình vuông cạnh bằng
10
cm bằng
cách khoét đi bốn phần bằng nhau có hình dạng parabol như
hình bên. Biết
5AB
cm,
4OH
cm. Tính diện tích bề mặt hoa
văn đó.
A.
2
140
cm .
3
B.
2
160
cm
3
. C.
2
14
cm
3
. D.
2
50 cm
Lời giải
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Câu 147.(THPT Thạch Thành 2019) Một công ty quảng cáo
X
muốn làm một bức tranh trang trí hình
MNEIF
ở chính
giữa của một bức tường hình chữ nhật
ABCD
có chiều cao
6 BC m
, chiều dài
12 CD m
(
hình vẽ bên
). Cho biết
MNEF
là hình chữ nhật có
4 MN m
; cung
EIF
có hình
dạng là một phần của cung parabol có đỉnh
I
là trung điểm
của cạnh
AB
và đi qua hai điểm
C, D
.
Kinh phí làm bức tranh
là 900.000 đồng/
2
m
. Hỏi công ty
X
cần bao nhiêu tiền để
làm bức tranh đó?
A. 20.400.000 đồng. B. 20.600.000 đồng. C. 20.800.000 đồng. D. 21.200.000 đồng.
Lời giải
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Câu 148.(Sở GD & ĐT Phú Thọ 2019) Một khuôn viên dạng nửa
hình tròn, trên đó người ta thiết kế phần trồng hoa hồng có
dạng một hình Parabol có đỉnh trùng với tâm hình tròn và trục
đối xứng vuông góc với đường kính của nửa đường tròn, hai
đầu mút của Parabol nằm trên đường tròn và cách nhau một
khoảng 4 mét (phần tô đậm). Phần còn lại của khuôn viên
(phần không tô đậm) dùng để trồng hoa cúc. Biết các kích
thước cho như hình vẽ. Chi phí trồng hoa hồng và hoa cúc lần
lượt là
120.000
đồng
2
m
và
80.000
đồng/
2
m
. Hỏi chi phí
trồng hoa khuôn viên đó gần nhất với số nào sau đây (làm tròn
đến ngàn đồng).
A.
6.847.000
đồng. B.
6.865.000
đồng. C.
5.710.000
đồng. D.
5.701.000
đồng.
Lời giải
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Câu 49.(THPT chuyên Hưng Yên 2017) Vòm cửa lớn của một trung tâm văn hóa có dạng hình
parabol. Người ta dự định lắp cửa kính cho vòm cửa này. Hãy tính diện tích mặt kính cần lắp vào
biết rằng vòm cửa cao
8m
và rộng
8m
.
A.
2
28
3
m
. B.
2
26
3
m
. C.
2
128
3
m
. D.
2
131
3
m
.
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Câu 150.(TTGDTX Vạn Ninh 2019) Vòm cửa lớn của một trung
tâm văn hoá có dạng hình Parabol. Người ta dự định lắp cửa
kính cường lực cho vòm cửa này. Hãy tính diện tích mặt kính
cần lắp vào biết rằng vòm cửa cao
8m
và rộng
8m
(như hình
vẽ)∙.
A.
2
131
3
m
. B.
2
28
()
3
m
. C.
2
26
()
3
m
. D.
2
128
3
m
.
Lời giải
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Câu 151.(THPT Lý Nhân Tông 2019) Một mảnh vườn hình tròn
tâm
O
bán kính 6m. Người ta cần trồng cây trên dải đất rộng
6m
nhận O làm tâm đối xứng, biết kinh phí trồng cây là
70000
đồng/
2
m
. Hỏi cần bao nhiêu tiền để trồng cây trên dải đất đó ?
A.
8 412 322
đồng. B.
4 821 322
đồng.
C.
3142 232
đồng. D.
4 821 232
đồng.
Lời giải
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Câu 152.(THPT Chuyên Quang Trung 2019)Một khu vườn
dạng hình tròn có hai đường kính
, AB CD
vuông góc với
nhau,
12AB m
. Người ta làm một hồ cá có dạng elip với bốn
đỉnh
, , ', 'M N M N
như hình vẽ.
Biết
10 , ' ' 8 , 8MN m M N m PQ m
.
Diện tích phần trồng cỏ (phần gạch sọc) bằng:
A.
2
32,03 m
. B.
2
20,33 m
.
C.
2
33.02 m
. D.
2
23,03 m
.
Lời giải
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Câu 153.(THPT Thuận Thành 2019) Bồn hoa của một trường X
có dạng hình tròn bán kính bằng
8m
. Người ta chia bồn hoa
thành các phần như hình vẽ dưới đây và có ý định trồng hoa
như sau: Phần diện tích bên trong hình vuông
ABCD
để trồng
hoa (phần tô đen). Phần diện tích kéo dài từ 4 cạnh của hình
vuông đến đường tròn dùng để trồng cỏ (phần gạch chéo). Ở 4
góc còn lại mỗi góc trồng một cây cọ. Biết
4AB m
, giá trồng
hoa là
200.000
đ/m
2
, giá trồng cỏ là
100.000
đ/m
2
, mỗi cây cọ
giá
150.000
đ. hỏi cần bao nhiêu tiền để thực hiện việc trang trí
bồn hoa đó (làm tròn đến hàng nghìn).
A.
13.265.000
đồng. B.
12.218.000
đồng. C.
14.465.000
đồng. D.
14.865.000
đồng.
Lời giải
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Câu 154.(THPT Yên Phong 2019) Bổ dọc một quả dưa hấu ta được một thiết diện là hình elip có
trục lớn
28cm
và trục bé
25cm
. Biết cứ
3
1000cm
dưa hấu sẽ làm được một cốc sinh tố bán giá
20000
đồng. Hỏi từ quả dưa hấu trên có thể thu được bao nhiêu tiền từ việc bán sinh tố? Biết
rằng bề dày của quả dưa hấu không đáng kể.
A.
180000
đồng. B.
183000
đồng. C.
185000
đồng. D.
190000
đồng.
Lời giải
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Câu 155.(THPT Nghĩa Hưng 2019) Một mặt bàn
hình elip có chiều dài là 120cm, chiều rộng là 60cm.
Anh Hải muốn gắn đá hoa cương cho mặt bàn theo
hình (phần đá hoa cương màu trắng và phần đá hoa
cương màu vàng), biết rằng phần đá hoa cương
màu vàng cũng là elip có chiều dài 100 cm và chiều
rộng là 40 cm. Biết rằng đá hoa cương màu trắng có giá
2
600.000 /vnd m
và đá hoa cương màu
vàng có giá
2
650.000 /vnd m
. Hỏi số tiền để gắn đá hoa cương theo cách trên gần với số tiền nào
dưới đây?
A.
355.000
đồng. B.
339.000
đồng. C.
368.000
đồng. D .
353.000
đồng.
Lời giải
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Câu 156.(Đề Minh Họa BGD) Ông An có một mảnh
vườn hình Elip có độ dài trục lớn bằng
16m
và độ dài
trục bé bằng
10m
. Ông muốn trồng hoa trên một dải
đất rộng
8m
và nhận trục bé của elip làm trục đối
xứng (như hình vẽ). Biết kinh phí để trồng hoa là
100.000
đồng/
2
1m
. Hỏi ông An cần bao nhiêu tiền để
trồng hoa trên dải đất đó? (Số tiền được làm tròn
đến hàng nghìn.).
A.
7.826.000
đồng. B.
7.653.000
đồng. C.
7.862.000
đồng. D.
7.128.000
đồng.
Lời giải
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Câu 157.(THPT Chuyên Võ Nguyên Giáp) Một khuôn viên
dạng nửa hình tròn có đường kính bằng
45
(m). Trên
đó người thiết kế hai phần để trồng hoa có dạng của một
cánh hoa hình parabol có đỉnh trùng với tâm nửa hình
tròn và hai đầu mút của cánh hoa nằm trên nửa đường
tròn (phần tô màu), cách nhau một khoảng bằng
4
(m),
phần còn lại của khuôn viên (phần không tô màu) dành
để trồng cỏ Nhật Bản.
Biết các kích thước cho như hình vẽ và kinh phí để trồng cỏ Nhật Bản là
100.000
đồng/m
2
. Hỏi
cần bao nhiêu tiền để trồng cỏ Nhật Bản trên phần đất đó? (Số tiền được làm tròn đến hàng
nghìn).
A.
2.388.000
(đồng). B.
3.895.000
(đồng). C.
1.194.000
(đồng). D.
1.948.000
(đồng).
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Lời giải
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Câu 158.(THPT Yên Lạc 2018) Một mảnh vườn hình elip có trục lớn bằng
100 m
và trục nhỏ
bằng
80 m
được chia làm hai phần bởi một đoạn thẳng nối hai đỉnh liên tiếp của elip. Phần nhỏ
hơn trồng cây con và phần lớn hơn trồng rau. Biết lợi nhuận thu được là
2000
mỗi
2
m
trồng cây
con và
4000
mỗi
2
m
trồng rau. Hỏi thu nhập của cả mảnh vườn là bao nhiêu? (Kết quả làm tròn
đến phần nghìn).
A.
31904000
. B.
23991000
. C.
10566000
. D.
17635000
.
Lời giải
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Câu 159.(THPT Triệu Thái Vĩnh Phúc 2019) Mảnh vườn nhà ông An có dạng hình elip với bốn
đỉnh
1
A
,
2
A
,
1
B
,
2
B
. Ông dùng 2 đường Parabol có đỉnh là tâm đối xứng của elip cắt elip tại
4
điểm
, , ,M N P Q
như hình vẽ sao cho tứ giác
MNPQ
là hình chữ nhật có
4MN
để chia vườn.
Phần tô đậm dùng để trồng hoa và phần còn lại để trồng rau. Biết chi phí trồng hoa là
600.000
đồng/
2
m
và trồng rau là
50.000
đồng/
2
m
. Hỏi số tiền phải chi gần nhất với số tiền nào dưới đây,
biết
12
8mAA
,
12
4mBB
?
A.
4.899.000
đồng B.
5.675.000
đồng C.
3.526.000
đồng D.
7.120.000
đồng
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Lời giải
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Câu 160.(THPT Ngô Quyền 2019) Một thùng đựng dầu có
thiết diện ngang (mặt trong của thùng) là một đường elip
có độ dài trục lớn bằng
2m
, độ dài trục bé bằng
1m,
chiều dài (mặt trong của thùng) bằng
3,5m.
Thùng được
đặt sao cho trục bé nằm theo phương thẳng đứng (như
hình bên). Biết chiều cao của dầu hiện có trong thùng
(tính từ điểm thấp nhất của đáy thùng đến mặt dầu) là
0,75m
. Tính thể tích
V
của dầu có trong thùng (Kết quả
làm tròn đến hàng phần trăm).
A.
3
4,42mV
. B.
3
3,23mV
. C.
3
1,26mV
. D.
3
7,08mV
.
Lời giải
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Câu 161.(Sở GD &ĐT Nam Định 2019) Biết rằng parabol
2
1
24
yx
chia hình phẳng giới hạn bởi
elip có phương trình
22
1
16 1
xy
thành hai phần có diện tích lần lượt là
12
,SS
với
12
SS
.
Tỉ số
1
2
S
S
bằng
A.
43
83
. B.
42
82
. C.
43
12
. D.
83
12
.
Lời giải
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Câu 162.(THPT CổLoa Hà Nội 2019) Để trang trí cho một lễ
hội đầu xuân, từ một mảnh vườn hình elip có chiều dài
trục lớn là
10
m, chiều dài trục nhỏ là
4
m, Ban tổ chức vẽ
một đường tròn có đường kính bằng độ dài trục nhỏ và có
tâm trùng với tâm của elip như hình vẽ. Trên hình tròn
người ta trồng hoa với giá
100.000
đồng/m
2
, phần còn lại
của mảnh vườn người ta trồng cỏ với giá
60.000
đồng/m
2
(biết giá trồng hoa và trồng cỏ bao
gồm cả công và cây). Hỏi ban tổ chức cần bao nhiêu tiền để trồng hoa và cỏ? (Số tiền được làm
tròn đến hàng nghìn).
A.
2387000
đồng. B.
2638000
đồng. C.
2639000
đồng. D.
2388000
đồng.
Lời giải
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Câu 163.(THPT Chuyên Sơn La 2019) Gia đình anh A có 1 bồn
hoa được thiết kế như hình dưới đây:
Ở đây
I
là tâm của hình tròn và cũng là trung điểm của
12
FF
,
12
,FF
là hai tiêu điểm của hình elip,
2
A
là một đỉnh của elip,
2 2 2
3, 1IF F A
. Anh A dự định trồng cỏ Nhật toàn bộ phần
diện tích tô đậm. Hỏi số tiền anh A cần phải trả để mua cỏ gần
nhất với số nào sau đây biết rằng giá cỏ Nhật là 65.000đ/m
2
?
A.
563.000
đ. B.
560.000
đ. C.
577.000
đ. D.
559.000
đ.
Lời giải
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4 m
10 m
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Câu 164.(Chuyên Đại Học Vinh)Sàn của một viện bảo tàng mỹ
thuật được lát bằng những viên gạch hình vuông cạnh
như hình bên. Biết rằng người thiết kế đã sử dụng các đường
cong có phương trình và để tạo hoa văn
cho viên gạch. Diện tích phần được tô đậm gần nhất với giá trị
nào dưới đây?
A. . B. . C. . D. .
Lời giải
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Câu 165.(THPT Ngô Sỹ Liên 2019) Người ta dự định trồng hoa Lan
Ý để trang trí vào phần tô đậm. Biết rằng phần tô đậm là diện tích
hình phẳng giới hạn bởi
32
1
2
y f x ax bx cx
và
2
1y g x dx ex
trong đó
, , , , .a b c d e
Biết rằng hai đồ
thị đó cắt nhau tại các điểm có hoành độ lần lượt bằng
3; 1; 2,
chi phí trồng hoa là 800000 đồng/1
m
2
và đơn vị trên các trục
được tính là 1 mét. Số tiền trồng hoa gần nhất với số nào sau đây?
(làm tròn đến đơn vị nghìn đồng).
A. 4217000 đồng. B. 2083000 đồng. C. 422000 đồng. D. 4220000 đồng.
Lời giải
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40 cm
24
4xy
32
4( 1)xy
2
506 cm
2
747 cm
2
507 cm
2
746 cm
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Câu 166.(Chuyên Trần Đại Nghĩa 2019) Một viên gạch hoa
hình vuông cạnh
40cm
được thiết kế như hình bên dưới.
Diện tích mỗi cánh hoa bằng
A.
2
400
cm
3
. B.
2
800
cm
3
. C.
2
250cm
. D.
2
800cm
.
Lời giải
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y
x
20
20
20
20
y =
20
x
y =
1
20
x
2
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