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Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
1
BI TP GII TCH 2 Kim tra gia k : T lun, vo tun hc th 9
Thi cui k : T lun
CHNG 1 Hnh hc vi phn
ng dng trong hnh hc phng 1. Vit phng trnh tip tuyn v php tuyn vi ng cong:
a) 3 22 4 3y x x x ti im ( 2;5) .
b) 21 xy e ti giao im ca ng cong vi ng thng 1y .
c) 3
3
1
3 1
22
tx
t
ytt
ti im (2;2)A .
d) 2 2
3 3 5x y ti im (8;1)M . 2. Tnh cong ca:
a) 3y x ti im c honh 1
2x .
b) ( sin )
(1 cos )
x a t t
y a t
( 0)a ti im bt k.
c) 2 2 2
3 3 3x y a ti im ( , )x y bt k ( 0)a .
d) br ae , ( , 0)a b ti im bt k. 3. Tm hnh bao ca h cc ng cong sau:
a) 2x
y cc
b) 2 2 1cx c y c) 2 2( )y c x c .
ng dng trong hnh hc khng gian 1. Gi s ( )p t
, ( )q t
, ( )t l cc hm kh vi. Chng minh rng:
a) ( ) ( )( ) ( )d d p t d q tp t q tdt dt dt
.
b) )()(')(
)())()(( tptdt
tpdttpt
dt
d .
c) ( ) ( )( ) ( ) ( ) ( )d dq t d p tp t q t p t q tdt dt dt
.
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
2
d) ( ) ( )( ) ( ) ( ) ( )d d q t d p tp t q t p t q tdt dt dt
.
2. Vit phng trnh tip tuyn v php din ca ng:
a)
2
2
sin
sin cos
cos
x a t
y b t t
z c t
ti im ng vi 4
t
, ( , , 0)a b c .
b)
sin
21
cos
2
t
t
e tx
y
e tz
ti im ng vi 0t .
3. Vit phng trnh php tuyn v tip din ca mt cong:
a) 2 2 24 2 6x y z ti im (2;2;3) .
b) 2 22 4z x y ti im (2;1;12) . c) ln(2 )z x y ti im ( 1;3;0) . 4. Vit phng trnh tip tuyn v php din ca ng:
a) 2 2
2 2
10
25
x y
y z
ti im (1;3;4)A .
b) 2 2 2
2 2
2 3 47
2
x y z
x y z
ti im ( 2;1;6)B .
CHNG 2 Tch phn bi
Tch phn kp 1. Thay i th t ly tch phn ca cc tch phn sau
a) 2
2
1 1
1 1
( , )x
x
dx f x y dy
b) 21 11
0 2
( , )y
y
dy f x y dx
c) 2
2 2
0 2
( , )x
x x
dx f x y dy
d) 212
0 sin
( , )y
y
dy f x y dx
e)
2. Tnh cc tch phn sau a) sin( )
D
x x y dxdy vi .
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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b)
2 ( )D
x y x dxdy vi D l min gii hn bi cc ng cong 2x y v 2y x .
c) | |D
x y dxdy vi .
d) 2| |D
y x dxdy , vi .
e) 2 3| |D
y x dxdy , vi .
f) 2D
xydxdy vi D gii hn bi cc ng 2 ; 1; 0x y x y v 1y .
g) | | | | 1
| | | |x y
x y dxdy
.
h) ( )D
x y dxdy vi D gii hn bi cc ng 2 2 1; 1x y x y .
3. Tm cn ly tch phn trong ta cc ca ( , )D
f x y dxdy trong D l
min xc nh nh sau: a) . b) .
c) .
4. Dng php i bin trong ta cc, hy tnh cc tch phn sau
a)
22
0
22
0
)1ln(xRR
dyyxdx , )0( R .
b)
2
2
22
0
xRx
xRx
R
dyyxRxdx , )0( R .
c) D
xydxdy , vi
1) D l mt trn 1)2( 22 yx
2) D l na mt trn 1)2( 22 yx , 0y .
d) D
dxdyxy2 , vi D l min gii hn bi cc ng trn 1)1( 22 yx v
0422 yyx . 5. Chuyn tch phn sau theo hai bin u v v :
a)
x
x
dyyxfdx ),(1
0
, nu t
yxv
yxu
b) p dng tnh vi 2)2(),( yxyxf . 6. Tnh cc tch phn sau
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
4
a) D yxdxdy
222 )(, trong
xyx
yyxyD
3
84:
22
b)
D
dxdyyx
yx22
22
1
1 , trong 1: 22 yxD .
c) Ddxdy
yx
xy22
, trong
0,0
32
2
12
:22
22
22
yx
yyx
xyx
yx
D
d) D
dxdyyx |49| 22 , trong 194
:22
yx
D
e) D
dxdyyx )24( 22 , trong
xyx
xyD
4
41:
Tch phn bi 3 Tnh cc tch phn bi ba sau
1. V
zdxdydz , trong min V c xc nh bi: 1
04
x , 2x y x ,
2 20 1z x y .
2. 2 2( )V
x y dxdydz , trong V xc nh bi: 2 2 2 1x y z ,
2 2 2 0x y z .
3. 2 2( )V
x y zdxdydz , trong V xc nh bi: 2 2 1x y , 1 2z .
4. 2 2
V
z x y dxdydz , trong
a) V l min gii hn bi mt tr: 2 2 2x y x v cc mt phng: 0y , 0z , z a , ( 0)a .
b) V l na ca hnh cu 2 2 2 2x y z a , 0z , ( 0)a .
c) V l na ca khi elipxit 2 2 2
2 21
x y z
a b
, 0z , ( , 0)a b .
5. V
ydxdydz , trong V l min gii hn bi mt nn: 2 2y x z v mt
phng y h , ( 0)h .
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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6. 22 22 2 2yx za b cV
dxdydz , trong V l min gii hn bi 2 2 2
2 2 21
x y z
a b c ,
( , , 0)a b c .
7. 2 2 2( )V
x y z dxdydz , trong V : 2 2 21 4x y z , 2 2 2x y z .
8. 2 2
V
x y dxdydz , trong V l min xc nh bi 2 2 2x y z , 1z .
9. D zyxdxdydz
2222 ))2((, trong V : 2 2 1x y , | | 1z .
10. 2 2 2
V
x y z dxdydz , trong V l min gii hn bi 2 2 2x y z z .
ng dng ca tch phn bi
1. Tnh din tch ca min D gii hn bi cc ng 2xy , 2 xy , 4y . 2. Tnh din tch ca min D gii hn bi cc ng
2y x , 2 2y x , 2x y , 2 2x y . 3. Tnh din tch ca min D gii hn bi
0y , 2 4y ax , 3x y a , 0y , ( 0)a . 4. Tnh din tch ca min D gii hn bi
xyxx 42 22 , xy 0 .
5. Tnh din tch ca min D gii hn bi cc ng trn 1r ; cos3
2r .
6. Tnh din tch ca min D gii hn bi cc ng
a) 2 2 2 2( ) 2x y a xy , ( 0)a .
b) 3 3x y axy , ( 0)a . c) (1 cos )r a , ( 0)a .
7. Chng minh rng din tch min D gii hn bi 2 2( ) 1x x y khng i . 8. Tnh th tch ca min gii hn bi cc mt
3 1x y , 3 2 2x y , 0y , 0 1z x y .
9. Tnh th tch ca min gii hn bi cc mt 2 24z x y , 2 22 2z x y .
10. Tnh th tch ca min gii hn bi 2 20 1z x y , y x , 3y x . 11. Tnh th tch ca min V gii hn bi mt cu 2222 4azyx v mt tr
0222 ayyx , 0y , ( 0)a .
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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12. Tnh th tch ca min gii hn bi cc mt 0z , 2 2
2 2
x yz
a b ,
2 2
2 2
2x y x
aa b , ( , 0)a b .
13. Tnh th tch ca min gii hn bi cc mt 2 2az x y , 2 2z x y , ( 0)a .
CHNG 3 Tch phn ph thuc tham s
1. Kho st s lin tc ca tch phn 1
2 20
( )( )
yf xI y dx
x y
vi ( )f x l hm s
dng, lin tc trn on [0,1] . 2. Tnh cc tch phn sau
a) 1
0
ln nx x dx , n l s nguyn dng.
b) 2
2
0
ln(1 sin )y x dx
, vi 1y .
3. Tm 1
2 20lim
1
y
yy
dx
x y
.
4. Xt tnh lin tc ca hm s 1 2 2
2 2 20
( )( )
y xI y dx
x y
.
5. Chng minh rng tch phn ph thuc tham s
dxx
yxyI
21
)arctan()( l
mt hm s lin tc, kh vi i vi bin y . Tnh '( )I y ri suy ra biu thc ca ( )I y .
6. Tnh cc tch phn sau
a) 1
0ln
b ax xdx
x
, (0 )a b . b)
0
x xe edx
x
, ( 0, 0) .
c)
2 2
20
x xe edx
x
, ( 0, 0) . d) 2 1
0 ( )n
dx
x y
.
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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e) 0
sin( ) sin( )ax bx cxe dxx
, ( , , 0)a b c . f)
2
0
cos( )xe yx dx
.
7. Biu th 0
sin cosm nx xdx
qua hm ( , )B m n , ( , ; , 1)m n m n .
8. Tnh cc tch phn sau
a) 2
6 4
0
sin cosx xdx
. b) 2 2 20
anx a x dx , ( 0)a , (Gi t x a t )
c) 210
0
xx e dx
. d) 2 20 (1 )
xdx
x
. e)
30
1
1dx
x
.
f)1
20 (1 )
n
n
xdx
x
, 2 n . g)
1
0
1
1n ndx
x , *( )n .
CHNG 4
Tch phn ng Tch phn ng loi 1 Tnh cc tch phn sau:
1. ( )C
x y ds , C l ng trn 2 2 2x y x .
2. 2
C
y ds , C l ng c phng trnh ( sin )
(1 cos )
x a t t
y a t
(0 2 , 0)t a .
3. 2 2
C
x y ds , C l ng cong (cos sin )
(sin cos )
x a t t t
y a t t t
(0 2 , 0)t a .
Tnh phn ng loi 2 Tnh cc tch phn sau:
1. 2 2( 2 ) (2 )AB
x xy dx xy y dy , trong AB l cung parabol 2y x t
(1;1)A n (2;4)B .
2. (2 )C
x y dx xdy , trong C l ng cong ( sin )
(1 cos )
x a t t
y a t
theo chiu
tng ca t , (0 2 , 0)t a .
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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3. 2 22( ) (4 3)ABCA
x y dx x y dy , trong ABCA l ng gp khc i qua
(0;0)A , (1;1)B , (0;2)C .
4. | | | |
ABCDA
dx dy
x y
, trong ABCDA l ng gp khc i qua (1;0)A , (0;1)B ,
( 1;0)C , (0; 1)D .
5. 2 24
2C
x y dxdy
, trong C l ng cong
sin
cos
x t t
y t t
theo chiu tng
ca 4
02
t .
6. Tnh tch phn sau
( ) ( )C
xy x y dx xy x y dy
bng hai cch: tnh trc tip, tnh nh cng thc Green ri so snh cc kt qu, vi C l ng:
a) 2 2 2x y R .
b) 2 2 2x y x .
c) 2 2
2 21
x y
a b , ( , 0)a b .
7. 2 2
2 2
24 4
x y x
x yx y dy y x dx
.
8. [(1 cos ) ( sin ) ]x
OABO
e y dx y y dy , trong OABO l ng gp khc qua (0;0)O , (1;1)A , (0;2)B .
9. 2 2 2
( sin ) ( sin )x y
x y x
xy e x x y dx xy e x y dy
.
10. 3
4 2 2( cos( )) ( cos( ))3
C
xxy x y xy dx xy x x xy dy , trong C l
ng cong cos
sin
x a t
y a t
( 0)a .
11. Dng tch phn ng loi 2 tnh din tch ca min gii hn bi mt nhp xycloit: ( sin )x a t t ; (1 cos )y a t v trc Ox, ( 0)a .
12. (3;0)
4 3 2 2 4
( 2; 1)
( 4 ) (6 5 )x xy dx x y y dy
.
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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13. (2;2 ) 2
2(1; )
(1 cos ) (sin cos )y y y y y
dx dyx x x xx
.
14. Tm hng s tch phn sau khng ph thuc vo ng i trong min xc nh
2 2(1 ) (1 )
(1 )AB
y dx x dy
xy
.
15. Tm cc hng s ,a b biu thc 2 2( sin( )) ( sin( ))y axy y xy dx x bxy x xy dy
l vi phn ton phn ca mt hm s ( , )u x y no . Hy tm hm s ( , )u x y . 16. Tm hm s ( )h x tch phn
2( )[(1 ) ( ) ]AB
h x xy dx xy x dy
khng ph thuc vo ng i trong min xc nh. Vi ( )h x va tm c,
hy tnh tch phn trn t )0;0(A n (1;2)B . 17. Tm hm s ( )h y tch phn
3 3( )[ (2 ) (2 ) ]AB
h y y x y dx x x y dy
khng ph thuc vo ng i trong min xc nh. Vi ( )h y va tm c, hy tnh tch phn trn t (0;1)A n ( 3;2)B . 18. Tm hm s ( )h xy tch phn
3 2 2 3( )[( ) ( ) ]AB
h xy y x y dx x x y dy
khng ph thuc vo ng i trong min xc nh. Vi ( )h xy va tm c, hy tnh tch phn trn t (1;1)A n (2;3)B .
CHNG 5
Tch phn mt
Tnh cc tch phn mt loi 1 sau y
1. 4
( 2 )3
S
yz x dS , trong {( , , ) : 1, 0, 0, 0}2 3 4
x y zS x y z x y z .
2. 2 2( )S
x y dS , trong 2 2{( , , ) : ,0 1}S x y z z x y z .
Tnh cc tch phn mt loi 2 sau y
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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3. 2 2( )S
z x y dxdy , trong S l na mt cu: 2 2 2 1x y z , 0z , hng
ca S l pha ngoi mt cu.
4. 2
S
ydzdx z dxdy , trong S l pha ngoi ca mt elipxoit:
22 2 1
4
yx z , 0x , 0y , 0z .
5. 2 2
S
x y zdxdy , trong S l mt trn ca na mt cu: 2 2 2 2x y z R ,
0z .
6. S
xdydz ydzdx zdxdy , trong S l pha ngoi ca mt cu:
2 2 2 2x y z a .
7. 3 3 3
S
x dydz y dzdx z dxdy , trong S l pha ngoi ca mt cu:
2 2 2 2x y z R .
8. 2 2
S
y zdxdy xzdydz x ydzdx , trong S l pha ngoi ca min: 0x ,
0y , 2 2 1x y , 2 20 z x y .
9. S
xdydz ydzdx zdxdy , trong S l pha ngoi ca min: 222)1( yxz , 1a z .
10. Gi S l phn mt cu 2 2 2 1x y z nm trong mt tr 2 2 0x x z , 0y , hng ca S l pha ngoi ca mt cu. Chng minh rng:
( ) ( ) ( ) 0S
x y dxdy y z dydz z x dzdx .
Trng i hc Bch Khoa H Ni Vin Ton ng dng v Tin hc - 2014
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CHNG 6 L thuyt trng
1. Tnh o hm theo hng l
ca hm 3 3 32 3u x y z ti im (2;0;1)A
vi l AB
, (1;2; 1)B .
2. Tnh mun ca grad u
, vi 3 3 3 3u x y z xyz
ti (2;1;1)A . Khi no th grad u
vung gc vi Oz , khi no th 0grad u
?
3. Tnh grad u
, vi
2 1 lnu r rr
, 2 2 2r x y z .
4. Theo hng no th s bin thin ca hm s sin cosu x z y z t gc (0;0;0)O l ln nht?
5. Tnh gc gia hai vect grad z
ca cc hm s 2 2z x y v
3 3z x y xy ti (3;4) . 6. Trong cc trng sau y, trng no l trng th:
a) 2 25( 4 ) (3 2 )a x xy i x y j k
.
b) a yzi xzj xyk
.
c) ( ) ( ) ( )a x y i x z j z y k
.
7. Cho 2 2 2F xz i yx j zy k
. Tnh thng lng ca F
qua mt cu S : 2 2 2 1x y z , hng ra ngoi.
8. Cho ( ) ( ) ( )F x y z i y z x j z x y k
, L l giao tuyn ca mt tr 2 2 0x y y v na mt cu 2 2 2 2x y z , 0z . Chng minh rng lu
s ca F
dc theo L bng 0.