化简：（x^-2y³)²*(x^-1y)^-2÷(xy^-2)³=?

化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x&# 已知x+y=2,xy=1/2,求x³y+2x²y²+xy³ 一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x 2x+y=0,求4x²+2xy(x+y)+y³ x³y-2x²y²+xy³ 化简：[(x+y)²-(x-y)²]÷2xy 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 因式分解：（x+y)³+2xy-2x²y-2xy²-1 【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a（x x-y/x²÷x²-2xy+y²/xy*（xy-x²） 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)