
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






4 3 2
P(x) 4x 11x 2ax 5bx 6
= − − + −


2
Q(x) x 2x 3
= − −


(
)
(
)
2013 2012 2011 2013 201 2 2011
P a 8a 11a b 8b 11b= − + + − +

 !"#
a 4 5, b 4 5
= + = − 

$%&'()*

2
c(c 9a ) a(4a b ) b(9b 4c )
+ + ≥
+ + +



ABC
0 0123'(45
(O)
 
AB AC
<
 (4
AD, BE, CF
!
ABC
6'78$19:(4;
EF, CB

<(4;
AI
=
(O)
7>#?
@
A, M, F, H, E
AB,3(45
$1C:
BC


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