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B畛 GIO D畛C V O T畉O
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畛 CHNH TH畛C
P N  THANG I畛M
畛 THI TUY畛N SINH 畉I H畛C NM 2013
M担n: TON; Kh畛i A v kh畛i A1
(叩p 叩n - thang i畛m g畛m 04 trang)
C但u 叩p 叩n i畛m
a. (1,0 i畛m)
Khi m = 0 ta c坦 3 2
3 1y x x .=  + 
 T畉p x叩c 畛nh: .D =
 S畛 bi畉n thi棚n:
- Chi畛u bi畉n thi棚n: ho畉c2
' 3 6 ; ' 0y x x y x=  + =  = 0 2.x =
0,25
Kho畉ng 畛ng bi畉n: (0; 2); c叩c kho畉ng ngh畛ch bi畉n: ( ; 0) v (2; ).+ 
- C畛c tr畛: Hm s畛 畉t c畛c ti畛u t畉i x = 0, yCT = 1; 畉t c畛c 畉i t畉i x = 2, yC = 3.
- Gi畛i h畉n: lim ; lim .
x x
y y
 +
= + = 
0,25
- B畉ng bi畉n thi棚n:
Trang 1/4
0,25
 畛 th畛:
0,25
b. (1,0 i畛m)
Ta c坦 2
' 3 6 3y x x=  + + .m
Hm s畛 (1) ngh畛ch bi畉n tr棚n kho畉ng (0; )+ khi v ch畛 khi ' 0, 0y x  >
0,25
2
2 , 0.m x x x    >
X辿t 2
( ) 2f x x x=  v畛i Ta c坦0.x > '( ) 2 2; '( ) 0 1.f x x f x x=  =  =
0,25
B畉ng bi畉n thi棚n:
0,25
1
(2,0 i畛m)
D畛a vo b畉ng bi畉n thi棚n ta 動畛c gi叩 tr畛 m th畛a m達n y棚u c畉u c畛a bi to叩n l m 1.
x
'y
y
  + 0 2
0 0 +
+ 
 1
3
2O
y
x
3
1
x
( )f x
0 + 1
0
0
+
1
+ 
'( )f x
  0,25
Trang 2/4
C但u 叩p 叩n i畛m
i畛u ki畛n: Ph動董ng tr狸nh 達 cho t動董ng 動董ng v畛icos 0.x 
sin
1 2(sin co
cos
x
s )x x
x
+ = + 0,25
(sin cos )(2cos 1) 0.x x x +  = 0,25

sin cos 0  ( )
4
x x x k k + =  =  +  . 0,25
2
(1,0 i畛m)

2cos 1 0 2 ( )
3
x x k k  =  = 賊 +  .
畛i chi畉u i畛u ki畛n ta 動畛c nghi畛m:


4
x k=  + ho畉c

2 ( )
3
x k k= 賊 +  .
0,25
44
2 2
1 1 2
2 ( 1) 6 1 0 (2)
x x y y
x x y y y
ァ + +   + =ェ
ィ
ェ +  +  + =ゥ
(1)
,i畛u ki畛n: T畛 (2) ta 動畛c suy ra1.x  2
4 ( 1)y x y= +  0.y 
0,25
3
(1,0 i畛m)
畉t 4
1,u x=  suy ra u Ph動董ng tr狸nh (1) tr畛 thnh:0. 4 4
2 2 (3).u u y y+ + = + +
X辿t 4
( ) 2 ,f t t= + + t v畛i Ta c坦0.t 
3
4
2
'( ) 1 0, 0.
2
t
f t t
t
= + >  
+
Do 坦 ph動董ng tr狸nh (3) t動董ng 動董ng v畛i ,y u= ngh挑a l 4
1.x y= +
0,25
Thay vo ph動董ng tr狸nh (2) ta 動畛c 7 4
( 2 4) 0 (4).y y y y+ +  =
Hm c坦7 4
( ) 2 4g y y y y= + +  6 3
'( ) 7 8 1 0g y y y= + + > v畛i m畛i 0.y 
0,25
M n棚n (4) c坦 hai nghi畛m kh担ng 但m l(1) 0,g = 0y = v 1.y =
V畛i ta 動畛c nghi畛m ( ; v畛i0y = ) (1; 0);x y = 1y = ta 動畛c nghi畛m ( ; ) (2; 1).x y =
V畉y nghi畛m ( ; )x y c畛a h畛 達 cho l v(1; 0) (2; 1).
0,25
畉t
2
2
1 d
ln , d d d , .
x x
u x v x u v x
1
x xx

= =  = = + 0,25
Ta c坦
22
1 1
1 1
ln dI x x x
1
x
x x x
   = +  +   
   
 0,25
2 2
1 1
1 1
lnx x x
x x
   = +     
   
0,25
4
(1,0 i畛m)
5 3
ln 2 .
2 2
=  0,25
G畛i H l trung i畛m c畛a BC, suy ra SH  BC. M (SBC)
vu担ng g坦c v畛i (ABC) theo giao tuy畉n BC, n棚n SH  (ABC).
0,25
Ta c坦 BC = a, suy ra
3
;
2
a
SH = o
sin30 ;
2
a
AC BC= =
o 3
cos30 .
2
a
AB BC= =
Do 坦
3
.
1
. .
6 1
S ABC
a
.
6
H AB AC= =V S
0,25
Tam gi叩c ABC vu担ng t畉i A v H l trung i畛m c畛a BC n棚n
HA = HB. M SH  (ABC), suy ra SA = SB = a. G畛i I l
trung i畛m c畛a AB, suy ra SI  AB.
0,25
5
(1,0 i畛m)
Do 坦
2
2 13
.
4 4
AB a
SI SB=  =
Suy ra . .3 6 39
( ,( )) .
. 1
S ABC S ABC
SAB
V V a
d C SAB
S SI AB
= = =
3
0,25
S
AB
C
I
H
Trang 3/4
C但u 叩p 叩n i畛m
畉t ,
a
x y
c c
= = .
b
Ta 動畛c i畛u ki畛n c畛a bi to叩n tr畛 thnh0, 0.x y> > 3.xy x y+ + =
Khi 坦
33
2 2
3 3
3232 .
( 3) ( 3)
yxP x
y x
= +  +
+ +
y
v> >V畛i m畛i u ta c坦0, 0
3
3 3 3 3 3 ( )3( ) 3 ( ) ( ) ( )
4 4
u v
.v u v uv u v u v u v
+
+ = +  +  +  + =u
Do 坦
333 23
3 3
32 ( ) 2 3 332 8 8
3 3 3 3 9( 3) ( 3)
y y x y xy xx x
y x xy x yy x
 +  + + +  + =     + + + + + + +  
.
y
0,25
Thay 3xy x=   y vo bi畛u th畛c tr棚n ta 動畛c
333
3
3 3
32 ( 1)( 6)32 8 (
2( 6)( 3) ( 3)
y x y x yx x y
x yy x
+  + + +  = +  + + + +
1) . Do 坦
3 2 2 3 2 3 2
( 1) ( 1) ( ) 2 ( 1) ( ) 2( ) 6.P x y x y x y x y xy x y x y x y +   + = +   +  = +   + + + 
0,25
畉t t x Suy ra t v.y= + > 0 3 2
( 1) 2 6.P t t t   + 
Ta c坦
2 2
( )
3 ( )
4 4
x y t
x y xy x y t
+
= + +  + + = + .n棚n ( 2)( 6) 0t t +  Do 坦 2.t 
X辿t 3 2
( ) ( 1) 2 6,f t t t t=   +  v畛i t Ta c坦2. 2
2
1
'( ) 3( 1) .
2 6
t
f t t
t t
+
=  
+ 
V畛i m畛i t ta c坦 v2 2
3( 1) 3t  
22
1 7 71 1
2 2( 1) 72 6
t
tt t
+ = +  + =
+ + 
3 2 , n棚n
3 2
'( ) 3 0.
2
f t   > Suy ra ( ) (2) 1 2.f t f =  Do 坦 1 2P   .
0,25
6
(1,0 i畛m)
Khi a th狸b c= = 1 2P =  . Do 坦 gi叩 tr畛 nh畛 nh畉t c畛a P l 1 2. 0,25
Do C d n棚n ( ; 2 5).C t t  G畛i I l t但m c畛a h狸nh ch畛
nh畉t ABCD, suy ra I l trung i畛m c畛a AC.
Do 坦 ( )4 2 3; .
2 2
t tI   +
0,25
Tam gi叩c BDN vu担ng t畉i N n棚n IN = IB. Suy ra IN = IA.
Do 坦 ta c坦 ph動董ng tr狸nh
( ) ( )
2 22 24 22 3 45 4 4 8
2 2 2
t tt t  +    +   =   +   
  
7.a
(1,0 i畛m)
3
2
+ 


1.t = Suy ra C(1; 7).
0,25
Do M 畛i x畛ng v畛i B qua C n棚n CM = CB. M CB = AD
v CM||AD n棚n t畛 gi叩c ACMD l h狸nh b狸nh hnh. Suy ra
AC||DM. Theo gi畉 thi畉t, BN  DM, suy ra BN  AC v
CB = CN. V畉y B l i畛m 畛i x畛ng c畛a N qua AC.
0,25
動畛ng th畉ng AC c坦 ph動董ng tr狸nh: 3 4 0.
.
x y+ + =
動畛ng th畉ng BN qua N v vu担ng g坦c v畛i AC n棚n c坦
ph動董ng tr狸nh 3 17 0x y  = Do 坦 (3 17; ).B a a+
Trung i畛m c畛a BN thu畛c AC n棚n
3 17 5 4
3 4 0 7.
2 2
a a
a
+ +  + + =  =  
 
( 4; 7).B  V畉y
0,25
 c坦 v辿ct董 ch畛 ph動董ng l ( 3; 2;1).u =   0,25
(P) qua A v nh畉n u lm v辿ct董 ph叩p tuy畉n, n棚n (P) c坦 ph動董ng tr狸nh
3( 1) 2( 7) ( 3) 0 3 2 14 0.x y z x y z    +  =  +   =
0,25
M thu畛c  n棚n (6 3 ; 1 2 ; 2 ).M t t    + t 0,25
8.a
(1,0 i畛m)
2 2 2 2
2 30 (6 3 1) ( 1 2 7) ( 2 3) 120 7 4 3 0AM t t t t t=    +    +  +  =    =
1t = ho畉c 3.
7
t Suy ra M=  (3; 3; 1)  ho畉c ( )51 1 17; ;
7 7 7
M   .
0,25
A D
B C M
N
I
Trang 4/4
C但u 叩p 叩n i畛m
S畛 ph畉n t畛 c畛a S l 3
7A 0,25
= 210. 0,25
S畛 c叩ch ch畛n m畛t s畛 ch畉n t畛 S l 3.6.5 90= (c叩ch). 0,25
9.a
(1,0 i畛m)
X叩c su畉t c畉n t鱈nh b畉ng
90 3
.
210 7
= 0,25
G畛i M l giao i畛m c畛a ti畉p tuy畉n t畉i A v B c畛a (C), H l giao
i畛m c畛a AB v IM. Khi 坦 (0; ),M t v畛i H l trung i畛m
c畛a AB. Suy ra
0;t 
2 2.
2
AB
AH = =
0,25
2 2
1 1 1
,
AH AM AI
= +
2
suy ra 2 10.AM =
Do 坦 2 2
4 2.MH AM AH=  =
M
| |
( , ) ,
2
t
MH d M=  = n棚n 8.t = Do 坦 (0; 8).M
0,25
動畛ng th畉ng IM qua M v vu担ng g坦c v畛i  n棚n c坦 ph動董ng
tr狸nh 8 0.x y+  = Do 坦 t畛a 畛 i畛m H th畛a m達n h畛
.
0
(4;4)
8 0
x y
H
x y
 =ァ
ィ
+  =ゥ
0,25
7.b
(1,0 i畛m)

A
I
B
H
M
Ta c坦 2 2 1
2 ,
4
IH IA AH HM=  = = n棚n
1
.
4
IH HM=
Do 坦 (5;3).I
V畉y 動畛ng tr嘆n (C) c坦 ph動董ng tr狸nh 2 2
( 5) ( 3) 10x y +  = .
0,25
(S) c坦 t但m v b叩n k鱈nh(1; 2;1)I  14.R = 0,25
2 2 2
| 2.1 3( 2) 1.1 11| 14
( ,( )) .
142 3 1
d I P R
+  + 
=
+ +
= = Do 坦 (P) ti畉p x炭c v畛i (S). 0,25
8.b
(1,0 i畛m)
G畛i M l ti畉p i畛m c畛a (P) v (S). Suy ra M thu畛c 動畛ng th畉ng qua I v vu担ng g坦c v畛i (P).
0,25(1 2 ; 2 3 ;1 ).M t t+  + + tDo 坦
Do M thu畛c (P) n棚n V畉y2(1 2 ) 3( 2 3 ) (1 ) 11 0 1.t t t+ +  + + +  =  =t (3;1;2).M 0,25
1 3
1 3 2
2 2
z i i
 
= + = + 
 
0,25
9.b
(1,0 i畛m)
 
2 cos sin .
3 3
i = + 
 
0,25
5 5 5 5
2 cos sin 16(1 3 ).
3 3
z i = + =  
 
iSuy ra 0,25
16( 3 1) 16(1 3) .w i= + + Do 坦
0,25
V畉y w c坦 ph畉n th畛c l 16( v ph畉n 畉o l3 1)+ 16(1 3).
------------- H畉t -------------

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  • 1. B畛 GIO D畛C V O T畉O ッッッッッッッッ 畛 CHNH TH畛C P N THANG I畛M 畛 THI TUY畛N SINH 畉I H畛C NM 2013 M担n: TON; Kh畛i A v kh畛i A1 (叩p 叩n - thang i畛m g畛m 04 trang) C但u 叩p 叩n i畛m a. (1,0 i畛m) Khi m = 0 ta c坦 3 2 3 1y x x .= + T畉p x叩c 畛nh: .D = S畛 bi畉n thi棚n: - Chi畛u bi畉n thi棚n: ho畉c2 ' 3 6 ; ' 0y x x y x= + = = 0 2.x = 0,25 Kho畉ng 畛ng bi畉n: (0; 2); c叩c kho畉ng ngh畛ch bi畉n: ( ; 0) v (2; ).+ - C畛c tr畛: Hm s畛 畉t c畛c ti畛u t畉i x = 0, yCT = 1; 畉t c畛c 畉i t畉i x = 2, yC = 3. - Gi畛i h畉n: lim ; lim . x x y y + = + = 0,25 - B畉ng bi畉n thi棚n: Trang 1/4 0,25 畛 th畛: 0,25 b. (1,0 i畛m) Ta c坦 2 ' 3 6 3y x x= + + .m Hm s畛 (1) ngh畛ch bi畉n tr棚n kho畉ng (0; )+ khi v ch畛 khi ' 0, 0y x > 0,25 2 2 , 0.m x x x > X辿t 2 ( ) 2f x x x= v畛i Ta c坦0.x > '( ) 2 2; '( ) 0 1.f x x f x x= = = 0,25 B畉ng bi畉n thi棚n: 0,25 1 (2,0 i畛m) D畛a vo b畉ng bi畉n thi棚n ta 動畛c gi叩 tr畛 m th畛a m達n y棚u c畉u c畛a bi to叩n l m 1. x 'y y + 0 2 0 0 + + 1 3 2O y x 3 1 x ( )f x 0 + 1 0 0 + 1 + '( )f x 0,25
  • 2. Trang 2/4 C但u 叩p 叩n i畛m i畛u ki畛n: Ph動董ng tr狸nh 達 cho t動董ng 動董ng v畛icos 0.x sin 1 2(sin co cos x s )x x x + = + 0,25 (sin cos )(2cos 1) 0.x x x + = 0,25 sin cos 0 ( ) 4 x x x k k + = = + . 0,25 2 (1,0 i畛m) 2cos 1 0 2 ( ) 3 x x k k = = 賊 + . 畛i chi畉u i畛u ki畛n ta 動畛c nghi畛m: 4 x k= + ho畉c 2 ( ) 3 x k k= 賊 + . 0,25 44 2 2 1 1 2 2 ( 1) 6 1 0 (2) x x y y x x y y y ァ + + + =ェ ィ ェ + + + =ゥ (1) ,i畛u ki畛n: T畛 (2) ta 動畛c suy ra1.x 2 4 ( 1)y x y= + 0.y 0,25 3 (1,0 i畛m) 畉t 4 1,u x= suy ra u Ph動董ng tr狸nh (1) tr畛 thnh:0. 4 4 2 2 (3).u u y y+ + = + + X辿t 4 ( ) 2 ,f t t= + + t v畛i Ta c坦0.t 3 4 2 '( ) 1 0, 0. 2 t f t t t = + > + Do 坦 ph動董ng tr狸nh (3) t動董ng 動董ng v畛i ,y u= ngh挑a l 4 1.x y= + 0,25 Thay vo ph動董ng tr狸nh (2) ta 動畛c 7 4 ( 2 4) 0 (4).y y y y+ + = Hm c坦7 4 ( ) 2 4g y y y y= + + 6 3 '( ) 7 8 1 0g y y y= + + > v畛i m畛i 0.y 0,25 M n棚n (4) c坦 hai nghi畛m kh担ng 但m l(1) 0,g = 0y = v 1.y = V畛i ta 動畛c nghi畛m ( ; v畛i0y = ) (1; 0);x y = 1y = ta 動畛c nghi畛m ( ; ) (2; 1).x y = V畉y nghi畛m ( ; )x y c畛a h畛 達 cho l v(1; 0) (2; 1). 0,25 畉t 2 2 1 d ln , d d d , . x x u x v x u v x 1 x xx = = = = + 0,25 Ta c坦 22 1 1 1 1 ln dI x x x 1 x x x x = + + 0,25 2 2 1 1 1 1 lnx x x x x = + 0,25 4 (1,0 i畛m) 5 3 ln 2 . 2 2 = 0,25 G畛i H l trung i畛m c畛a BC, suy ra SH BC. M (SBC) vu担ng g坦c v畛i (ABC) theo giao tuy畉n BC, n棚n SH (ABC). 0,25 Ta c坦 BC = a, suy ra 3 ; 2 a SH = o sin30 ; 2 a AC BC= = o 3 cos30 . 2 a AB BC= = Do 坦 3 . 1 . . 6 1 S ABC a . 6 H AB AC= =V S 0,25 Tam gi叩c ABC vu担ng t畉i A v H l trung i畛m c畛a BC n棚n HA = HB. M SH (ABC), suy ra SA = SB = a. G畛i I l trung i畛m c畛a AB, suy ra SI AB. 0,25 5 (1,0 i畛m) Do 坦 2 2 13 . 4 4 AB a SI SB= = Suy ra . .3 6 39 ( ,( )) . . 1 S ABC S ABC SAB V V a d C SAB S SI AB = = = 3 0,25 S AB C I H
  • 3. Trang 3/4 C但u 叩p 叩n i畛m 畉t , a x y c c = = . b Ta 動畛c i畛u ki畛n c畛a bi to叩n tr畛 thnh0, 0.x y> > 3.xy x y+ + = Khi 坦 33 2 2 3 3 3232 . ( 3) ( 3) yxP x y x = + + + + y v> >V畛i m畛i u ta c坦0, 0 3 3 3 3 3 3 ( )3( ) 3 ( ) ( ) ( ) 4 4 u v .v u v uv u v u v u v + + = + + + + =u Do 坦 333 23 3 3 32 ( ) 2 3 332 8 8 3 3 3 3 9( 3) ( 3) y y x y xy xx x y x xy x yy x + + + + + = + + + + + + + . y 0,25 Thay 3xy x= y vo bi畛u th畛c tr棚n ta 動畛c 333 3 3 3 32 ( 1)( 6)32 8 ( 2( 6)( 3) ( 3) y x y x yx x y x yy x + + + + = + + + + + 1) . Do 坦 3 2 2 3 2 3 2 ( 1) ( 1) ( ) 2 ( 1) ( ) 2( ) 6.P x y x y x y x y xy x y x y x y + + = + + = + + + + 0,25 畉t t x Suy ra t v.y= + > 0 3 2 ( 1) 2 6.P t t t + Ta c坦 2 2 ( ) 3 ( ) 4 4 x y t x y xy x y t + = + + + + = + .n棚n ( 2)( 6) 0t t + Do 坦 2.t X辿t 3 2 ( ) ( 1) 2 6,f t t t t= + v畛i t Ta c坦2. 2 2 1 '( ) 3( 1) . 2 6 t f t t t t + = + V畛i m畛i t ta c坦 v2 2 3( 1) 3t 22 1 7 71 1 2 2( 1) 72 6 t tt t + = + + = + + 3 2 , n棚n 3 2 '( ) 3 0. 2 f t > Suy ra ( ) (2) 1 2.f t f = Do 坦 1 2P . 0,25 6 (1,0 i畛m) Khi a th狸b c= = 1 2P = . Do 坦 gi叩 tr畛 nh畛 nh畉t c畛a P l 1 2. 0,25 Do C d n棚n ( ; 2 5).C t t G畛i I l t但m c畛a h狸nh ch畛 nh畉t ABCD, suy ra I l trung i畛m c畛a AC. Do 坦 ( )4 2 3; . 2 2 t tI + 0,25 Tam gi叩c BDN vu担ng t畉i N n棚n IN = IB. Suy ra IN = IA. Do 坦 ta c坦 ph動董ng tr狸nh ( ) ( ) 2 22 24 22 3 45 4 4 8 2 2 2 t tt t + + = + 7.a (1,0 i畛m) 3 2 + 1.t = Suy ra C(1; 7). 0,25 Do M 畛i x畛ng v畛i B qua C n棚n CM = CB. M CB = AD v CM||AD n棚n t畛 gi叩c ACMD l h狸nh b狸nh hnh. Suy ra AC||DM. Theo gi畉 thi畉t, BN DM, suy ra BN AC v CB = CN. V畉y B l i畛m 畛i x畛ng c畛a N qua AC. 0,25 動畛ng th畉ng AC c坦 ph動董ng tr狸nh: 3 4 0. . x y+ + = 動畛ng th畉ng BN qua N v vu担ng g坦c v畛i AC n棚n c坦 ph動董ng tr狸nh 3 17 0x y = Do 坦 (3 17; ).B a a+ Trung i畛m c畛a BN thu畛c AC n棚n 3 17 5 4 3 4 0 7. 2 2 a a a + + + + = = ( 4; 7).B V畉y 0,25 c坦 v辿ct董 ch畛 ph動董ng l ( 3; 2;1).u = 0,25 (P) qua A v nh畉n u lm v辿ct董 ph叩p tuy畉n, n棚n (P) c坦 ph動董ng tr狸nh 3( 1) 2( 7) ( 3) 0 3 2 14 0.x y z x y z + = + = 0,25 M thu畛c n棚n (6 3 ; 1 2 ; 2 ).M t t + t 0,25 8.a (1,0 i畛m) 2 2 2 2 2 30 (6 3 1) ( 1 2 7) ( 2 3) 120 7 4 3 0AM t t t t t= + + + = = 1t = ho畉c 3. 7 t Suy ra M= (3; 3; 1) ho畉c ( )51 1 17; ; 7 7 7 M . 0,25 A D B C M N I
  • 4. Trang 4/4 C但u 叩p 叩n i畛m S畛 ph畉n t畛 c畛a S l 3 7A 0,25 = 210. 0,25 S畛 c叩ch ch畛n m畛t s畛 ch畉n t畛 S l 3.6.5 90= (c叩ch). 0,25 9.a (1,0 i畛m) X叩c su畉t c畉n t鱈nh b畉ng 90 3 . 210 7 = 0,25 G畛i M l giao i畛m c畛a ti畉p tuy畉n t畉i A v B c畛a (C), H l giao i畛m c畛a AB v IM. Khi 坦 (0; ),M t v畛i H l trung i畛m c畛a AB. Suy ra 0;t 2 2. 2 AB AH = = 0,25 2 2 1 1 1 , AH AM AI = + 2 suy ra 2 10.AM = Do 坦 2 2 4 2.MH AM AH= = M | | ( , ) , 2 t MH d M= = n棚n 8.t = Do 坦 (0; 8).M 0,25 動畛ng th畉ng IM qua M v vu担ng g坦c v畛i n棚n c坦 ph動董ng tr狸nh 8 0.x y+ = Do 坦 t畛a 畛 i畛m H th畛a m達n h畛 . 0 (4;4) 8 0 x y H x y =ァ ィ + =ゥ 0,25 7.b (1,0 i畛m) A I B H M Ta c坦 2 2 1 2 , 4 IH IA AH HM= = = n棚n 1 . 4 IH HM= Do 坦 (5;3).I V畉y 動畛ng tr嘆n (C) c坦 ph動董ng tr狸nh 2 2 ( 5) ( 3) 10x y + = . 0,25 (S) c坦 t但m v b叩n k鱈nh(1; 2;1)I 14.R = 0,25 2 2 2 | 2.1 3( 2) 1.1 11| 14 ( ,( )) . 142 3 1 d I P R + + = + + = = Do 坦 (P) ti畉p x炭c v畛i (S). 0,25 8.b (1,0 i畛m) G畛i M l ti畉p i畛m c畛a (P) v (S). Suy ra M thu畛c 動畛ng th畉ng qua I v vu担ng g坦c v畛i (P). 0,25(1 2 ; 2 3 ;1 ).M t t+ + + tDo 坦 Do M thu畛c (P) n棚n V畉y2(1 2 ) 3( 2 3 ) (1 ) 11 0 1.t t t+ + + + + = =t (3;1;2).M 0,25 1 3 1 3 2 2 2 z i i = + = + 0,25 9.b (1,0 i畛m) 2 cos sin . 3 3 i = + 0,25 5 5 5 5 2 cos sin 16(1 3 ). 3 3 z i = + = iSuy ra 0,25 16( 3 1) 16(1 3) .w i= + + Do 坦 0,25 V畉y w c坦 ph畉n th畛c l 16( v ph畉n 畉o l3 1)+ 16(1 3). ------------- H畉t -------------