18x²(x-2y)²-24xy(2y-x)²-6x(2y-x)³

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） 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²) 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) (x-6y)/(x²-4y²)+(2y)/(x²-2xy) 2x+y=0,求4x²+2xy(x+y)+y³ 因式分解x的5次方y-x³y+2x²y-xy (-x-2y)(x²-2xy+4y²)