Đ THI HSG HUYN BNH XUYÊN - VNH PHC - NĂM HC 2008-2009
Bi 1
−
− =
− − +
Bi 2!"#$%&'()*+( *
,*
(*,(,-
Bi 3.$&/0"'
1
* * * * * − + + + + = + −
Bi 423456/789':;<=
·
;4 = α
>?@
.ABCDED/FD=G
HI2;3<=;4.AJ.<=KDED/FD=AHI2;33;<=2;4
3L2B94C:M
J.NN2<=
J. 2
JK 34
=
MC2>
OKJ. OBMC
Bi 5P/06Q'R
− − − − − + − − −
− = = = =
− − − − − − + − + +
− − + − + − − − − − −
= = = =
− + + − + − + + + +
Bi 2!"#$%&'()*+( *
T*
(*T(T-
.$
!5 ⇔(*
*
*T-⇔
* * - * * * - * -
( *
* * *
+ − + + − −
= = = +
+ + +
U"(∈V)*T-*
⇔*T- *- *
* -
=
+ = =
= = −
+ = ⇔ = ⇔ ⇔
=
=
+ = =
= −
!(<=&/0"
UY*Z
UY*T⇒(T
UY*-⇒(-
UY*T-Z
U[(*+( ∈\T+T +-+- ]
=
+ + =
+ + + − =
U[(&/0"65^RP'(#D=*
Bi 423456/789':;<=
·
;4 = α
>?@
.ABCDED/FD=G
HI2;3<=;4.AJ.<=KDED/FD=AHI2;33;<=2;4
3L2B94C:M
J.NN2<=
J. 2
JK 34
=
MC2>
OKJ. OBMC
.$
O3_`5
3J 3.
3_ 3`
= =
MB 34
=
%c&E
J. 2
JK 34
=
'(
MC J.
MB JK
=
f:5
·
·
.JK ;4=
>5A5%&:/0
465
·
·
BMC .JK= = α
U[(OK.J OBMC
Bi 5P/06Q'R
+ + ≥
+ + +
.$ !5
+ +
+ + ≥ + + −
+ + +
_%
X ⇔X⇔T XT
U[(
+ + ≥ − =
+ + +
4#'kl*$(⇔
α
α
α
α
f
M
K
J
.
C
B
e
`
_
d
;