 
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Thời gian làm bài: 90 phút

$%(2,0 đim). 
   
      
= + − − + −
 !"#$%&%'()*

+, /012*&3
4
 −
"

3
$% (3,0 đim). 

5   6 
= − +
"

   
= − −
4
5  
+

4
5  
−


 
: J . I.
= − − −
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
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
 !"#
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23 4567896 3:;
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<=3:;>
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  = −
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
  3   I
− = − − = −
C

 3  
= − =
C

<=3:;>
 9 :
+ =
L
 : 9= −

( ) ( )
  
  . . .  . .
= + − − −
C
   
  . . .  . . . .
= + − − + = −
C
$%&
<=3:;>
[\7]CE
M
E
H
C
B
A
^_
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∆
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B:A
∆

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'F 
·
=
0
BAE 9 0
L
·
=
0
MAE 90
M`
·
=
0
BHE 90
L
·
=
0
EHC 90
M`
G .
·
=
MAE
·
=
0
EHC 90

·
=
0
BHM 90
# .:DbDB C
/"G .:bDB C
$%'
<=3:;>
cY.9d"H:CQe
( ) ( )
    
9 :  I . . J . I.
+ = − + + + − − −
<
  
 I 6.
− − −
C
D
  
 C I C 6. − ≤ − ≤ − ≤
3G .
9 : 
+ ≤
3 C
[f.LM=NO'P1QR(S'P
*C.3
C

?@ABHc sinh lm cch khc đng vn cho đim ti đa.