Tải bản đầy đủ (.doc) (6 trang)

2010-TOÁN-kD-DH-Lời Giải_ngay 9. 7

Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (284.83 KB, 6 trang )


 !"
#$%&'()*!+,-
./(*!+,-
 
y x x= − − +
 !"
#$%&'()$*+ !,$*+*-''./%0'1'



y x= −
./(*!+,-
2$%&'()
    3   4x x x x− + − − =
2$%&'()
3 3
     
     
x x x x x x
x
+ + + + + −
+ = + ∈ ¡
./(*!+,-566$7

3
 8
e
I x xdx
x
 


= −
 ÷
 

./0(*!+,-).$S.ABCD.+ABCD8)*-'9a,9SA =
a:)**-''.   !; S (<$1' (ABCD) 8 = H *> 9 AC,

AC
AH =
. 2?CM 8%0'! !!'SAC@'M8(*'= !SA
6=6A@BCSMBCDa
./0(*!+,-5)'(EF !
 
  3 4y x x x x= − + + − − + +
#$12(3*!+,-
Th sinh ch đưc lm mt trong hai phn (456789-
:;68<=>?@A/B
./0:C(*!+,-
 5('<$1'9>GH+,!'IJ.;I3:KL,(78M3:K,7
%0'(N'9$8OK:4P9>;,.>B%&'
 5('A-''!9>GH+Q,!<$1'RSHT+TQ−3U4VSH−+TQ−
U4#$%&'()<$1'W*-''./RV!A'XG
WY'
./0:C(*!+,-5)$@Q"
z =
Q

8*Z
9:;68<=>?@A.>8C6
./0:D(*!+,-

 5('<$1'9>GH+,=I4:∆8%0'1'[*!G2?M8)
**-''. !I(∆#$%&'()%0'1'∆,A'XM
(\Y'IM
 5('A-''!9>GH+Q,!%0'1'∆

S
3x t
y t
z t
= +


=


=

∆

S
 
  
x y z− −
= =

P9>=]*>∆

!A'X]∆

Y'

./0:D(*!+,-2C$%&'()



  4
 , 
8'   8' 4
x x y
x y
x y

− + + =



− − =


¡
J^O2O_O2`Oa
#$%&'()*!+,-
./
 
  y x x C= − − +
b,
5PcSdUW:

3 
e   : e 4    4 4: y x x y x x x y= − − = ⇔ − + = ⇒ = =



f   4y x= − − < ⇒
8(W

8 8
x x
y y
→+∞ →−∞
= = −∞
HK∞ 4 T∞
+eT 4−
+ 
K∞ K∞
M'(A'K∞:4,'(A'4:T∞
+999HU4,+
c
U
∩GHSI
 :4±

b 5$*+∆*-''.BS



y x= −

R∆S+U−HT
∆$Hg⇔C!*.'CS
 
3

  
4
  
x x x b x
b
x x

− − + = − + =



 
=
− − = −



#h+∆S+U−HT4
./
b2$%&'()S
    3   4x x x x− + − − =


    3   4
   3  4
      4
    4
x x x x x
x x x
x x x x

x x x
⇔ − + + − − =
⇔ − + + − =
⇔ − + − + =
⇔ − + + =





i
   
  

x k
x
x x VN
x k k Z
π

= + π


=

⇔ ⇔


π


+ = −
= + π ∈



b
3 3
     
   
x x x x x x+ + + + + −
+ = +
j: ASH≥−
3
     
      4
x x x x+ + − −
− − − =
⇔
3
   
    4
x x x− + +
− − =
•
 
    4 
x
x x

= ⇔ − = ⇔ =

•
3
  
 
x x+ +
=
3
  x x⇔ = + +
3
k   x x− = + −
⇔

 
   
 
x
x x x
x

− + + =
+ +

 4 

 
 
x x
x x
x
• − = ⇒ =

• + + =
+ +
#5U
 
    3 3x x x+ + = + + ≥
#RU


 x
≤ ⇒
+ +
R%&'()-'C#h+Sl'CjSHU:HU
./
 
  
3 
 8  8 3 8 
e e e
I I
I x xdx x xdx x dx
x x
 
= − = −
 ÷
 
∫ ∫ ∫
1 4 2 4 3 1 42 4 3


8

e
I x xdx=

E c<
8
dx
u x du
x
= ⇒ =
:


x
dv xdx v= ⇒ =
   


 
  
8
     
e e
e
x e x e
I x xdx
   
+
= − = − =
 ÷  ÷
   


56O

Sc<U8H⇒
dx
dt
x
=
HU:U4:HUD:U




4
4

 
t
I tdt
 
= = =
 ÷
 

#h+



e
I


=
./0
5!.


 
 
a a
SH a
 
= − =
 ÷
 ÷
 


 
 3  3

  
a a a
SC a
 
= + = =
 ÷
 ÷
 
UI
#h+∆mI79%0'!9XH*'∆mI

68(*'= !mI
5X]!9*-''./I,]U


mM
5!.
3

   
   
3   
a a
V S ABC a
 
= =
 ÷
 
lV(MABC) = V(MSBC) =


V(SABC) =
3

k
a

./0


3 n

  i
 
y x x
 
= − − + − − − +
 ÷
 
:AS


  4 3 L
 i
 i
3 4 4
x x x
x
x
x x

− + + ≥ − ≤ ≤


⇔ ⇔ − ≤ ≤
 
− ≤ ≤
− + + ≥



   

3 3

  
 
e
   i   i
3 n 3 n

   
x x
x x
y
x x
x x
   
− − −
 ÷  ÷
− − −
   
= − = −
− − + − − +
   
− − + − − +
 ÷  ÷
   


3 3 n
e 4   i  
  

y x x x x
   
= ⇔ − − − + = − − − +
 ÷  ÷
   
 
 
3
  4

3 3 n
  i  
  
x x
x x x x

 
− − ≥
 ÷

 



 
   

 
− − − + = − − − +
 

 ÷  ÷
 

   
 
 



3


3
4 L 

3 n
i  
 
3
4 L 

x x
x x
x x
x x

≤ ∨ ≥




 

− = −

 ÷


 
 


− = − ⇔
 ÷


 
 
− = − −


 ÷
 


3



 
4 i L  3 

3
4 i L  L n n
 
L
x x
x nhan
x x x
x x x
x loai

≤ ∨ ≥





=


− = − =
 

⇔ ⇔

 

− = − + =
 

=





H− b3 i
+e −4T
+ +

b
3



: 
3
y y
 
= =
 ÷
 
AS.=A-'Z',;Z+K,+b3+i
#$12(3*!+,-
Th sinh ch đưc lm mt trong hai phn (456789-
:;68<=>?@A/B
./0:C
b jSlBIMo%0'(N7O9=Me
⇒J[*!(*'=MMe
R%&'()IMSHU3
c%0'(N.$S
 

  Lx y+ + =
Me8'!= !IM%0'(N
⇒Me3:L
c%0'1'J.$%&'()S+U3o
%0'(N9=.>8'C
$%&'()S
 
  3 Lx + + =

⇒
i x = −
8F+>B%&':+U3
#h+
i −
:3
jS2?8%0'(N7O−:4,
A6WU
LIA =
R%0'(NS
 
  Lx y+ + =
2?II

8%0'A6⇒JMI

8))
⇒MI

[*!](*'=J
5!.O]8%0'(*') !∆I


IM
lS


 :3
3

M
M
x
IM AH M
y
= −

= ⇔ ⇔ −

=

uuur uuur
RJ[*!]*-''.IMS+−3U4
59>C$%&'()S
 
  L
 i
3 4
3
4
x y
x

y
y
x

+ + =

= − +


− = ⇔
 
=



>

 #h+
i −
:3
b R#5
::
P
n =
uur
:R#5
: :
Q
m = −
uuur

:R#5
:4:  :4: 
R
k n m= ∧ = − = −
uur r ur
R%&'()W.B9'SH−QTdU45!.SB4:WU
  

D
D⇔ = ⇔ = ±
R%&'()WS
  4   4x z hay x z− + = − − =
./0:C c<
  
z a bi z a b abi= + ⇒ = − +

5!.C$%&'()
  
  
4 
 
a b a
a b b
 
− = =
 

 
+ = =
 

 
 #h+S
 
3 
 , 
 , 
z i z i
z i z i
= + = −
= − + = − −
9:;68<=>?@A.>8C6
./0:D
bFS2?MH
4
:+
4
8)* !IH*'∆
5!.S
4 4 4 4
 : ,  : AH x y OH x y= − =
uuur uuur
d'S

 
4 4 4
4 4 4

 
4 4
4 4 4

  4
 4
 4
 , 
  4
 
x y y
x y y
AH OH
AH d H Ox
x y
x y y

+ − =

+ − =

=
  
⇒ ⇔
  
=
− + =

+ − =






uuur uuur

4


4
4 4
4


4 4
4 4
4

4
 i
k  i
  4
 i
  4
 
 i
k  i 4 
y
x
y y
y
x y
x y
y

x loai


= − +





= − +

+ − =
= − ± 
  
⇒ ⇔ ⇒

 
− + =

= −


= − −





= − − <




(
)
4
4
 i k
 i k:  i
 i
x
H
y

= ± −

⇔ ⇒ ± − − +

= − +


 R%&'()∆S
 i   i k 4x y− ± − =
FS
•∆≡G+⇒M≡ISA-'IMUBM,GH
•∆≡GH⇒M≡GSA-'IMUBM,GH
•R∆S+UAHA≠4


AH
y x

AH qua A
k
⊥ ∆

⇒ = − +


59>MU∆∩IMC


 



 

:

 



k
x
y kx
k k
k
H
k k
y x

k
y
k
k

=
=


 
+
 
⇔ ⇒
 
 ÷
+ +
= − +
 
 
=


+



 
 
  



  
 :    4
  
 i
  i


 i
4  

k k k
AH d H Ox k k
k k k
k
k
k loai
 
 
= ⇔ + − = ⇔ − − =
 ÷
 ÷
+ + +
 
 

+
=

+


⇔ ⇔ = ±


= <


#h+∆S
  i

y x
+
= ±
b]∈∆

⇒]3T::


::4
 ::
qua A
co VTCP a




=


uur

5!.S
 : : AM t t t= + −
uuuur


p , q  :: 3a AM t t⇒ = − −
uur uuuur
:B]:∆

U
 
 
    3

  
 ::
 4 L 3  4 k 4
 L::
t t
t M
t t t t
t M
− + + −
⇔ =
+ +
= ⇒

⇔ − + = ⇔ − + = ⇔

= ⇒


./0:D



  4 
8'   8' 4 
x x y
x y

− + + =


− − =


E ASHr,+r4

 

 

y x
x y
y x
= −

⇒ − = ⇒

= −


j

4  
     4
3
x loai
y x x x x
x
=

= − ⇒ − + − + =

=

j


   4
 
 
i  4

x x x
y x
x loai
x x
x

− + − + =


= − ⇒
=


− + =


=


⇒ xU3:+U
xU:+U−
@5!G/C>@5!H
(@/>?.,9"0IJK0L0!M-

×