化简:-{-【-(-x²)-y²】}
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
化简:(2x-y)²-4(x-y)(x+y)
化简(y根号x+x根号y)/(xy-y²)-(x+根号xy+y)/(x根号x-y根号y).
化简:(x²+y²/x-y)-(2xy/x-y)
化简:[(x×根号x+x×根号y)/(xy-y²)]-[(x+根号下xy+y)/(x×根号x-y×根号y)]
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
因式分解(x+y)²(x-y)-(x+y)(x²+y²)
(x+y)²(x-y)+(x+y)(x-y)²
(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