25(x+y)²-9(x-y)²
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
因式分解(x+y)²(x-y)-(x+y)(x²+y²)
(x+y)²(x-y)+(x+y)(x-y)²
4(x+y)²-20(x+y)+25
(x-2y)²+(2x-4y)(x+y)+(x+y)²
因式分解 -5x³y(x-y)³+20y【x²(y-x)】²
(x-y)³(y-x)(y-x)²+(x-y)^6
因式分解:25(x-y)²+10(y-x)+1