25(x+y)²-9(x-y)²
(x-y)³+9(x-y)-6(x-y)²
因式分解:9(x-y)²-25(x+y)²
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
因式分解:x²(x-y)+(y-x)
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
(2x-y)²-4(x-y)(x+2y)
(x-y)³(x-y)²(y-x)等于多少
化简:(2x-y)²-4(x-y)(x+y)
(三分之二x√9x +6x√x/y)+(y√y/x -x²√x/1)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
x²-y²+x+y