(1)(-2y-x)(+2y-x)-(x+2y)2，其中x=1,y=2.
(2)解方程：(2x-3)2-4(x-2)(x+2)=1
[拓展与延伸]
(1)(2x+7y)2 (2)(-3x+1)2 (3)()2
(4)2 (5)()() (6)(ab-)(ab+)
(7) (2a2-3b)(-2a2-3b) (8)()()
(9)(-3+2a2)(-3-2a2) (10)(-3x+4y)(3x-4y)
(11)(2m-5n)(4m+10n) (12)(a+b)(a-b)(a2+b2) (13)204×196
(14) (15)1032 (16)9982
2.下列计算正确的是( )
A、(a+3b)(a-3b)=a2-3b2 B、(-a+3b)(a-3b)=-a2-9b2
C、(a-3b)(a-3b)=a2-9b2 D、(-a-3b)(-a+3b)=a2-9b2
1.在下列多项式的乘法中，可以用平方差公式计算的是( )
A、(x+3)(3+x) B、(a+)()
C、(-x+y)(x-y) D、(a2-b)(a+b2)
10.已知：(x-3y)2=x2-6xy+(ky)2, 则k=
9.102×98= ( ) ( ) = ( ) 2-( ) 2=
8. (3x+ ) 2= +12xy+
7. (mn- ) ( -) =
6. X2-6xy+ ( ) = ( ) 2
5. (3a-1) ( ) =9a2-1
)2 
2 (5)(
)(
) (6)(ab-
)(ab+
)(
) 
(15)1032 (16)9982
)(
)
) =