(2x³+9x²y+xy²-12y³)÷(2x+3y)
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
x³y-2x²y²+xy³
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
【x(x²y²-xy)-y(x²-x³y)】÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
-2y³+(3xy²-x²y)-2(xy²-y³)
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
x²-2xy+y²分之x²+2xy-3y³如何因式分解