化简x+y\x²-y² - 2x-y\4x(x-y)+y²
化简:(2x-y)²-4(x-y)(x+y)
(2x-y)²-4(x-y)(x+2y)
因式分解:x²(x-y)+(y-x)
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x+y)²+4(x+y)-5
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
{(x,y) |x|+|y|