x³+x²y/x²y-y³-x﹙x-y﹚/xy+x²-2xy/x

x²/xy-x/y [-xy/(x-y)²]²×(y²-xy/x)³ 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 计算：(xy-x²)×x-y/xy x³y-2x²y²+xy³ 化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x&# x-y/x²÷x²-2xy+y²/xy*（xy-x²） -x³y³-x²y²+xy 【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²) 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y 【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a（x