[x﹙x²y²-xy)-y(x²-x³y﹚]÷3x²y
x²/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
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
[-xy/(x-y)²]²×(y²-xy/x)³
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
计算:(xy-x²)×x-y/xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
-x³y³-x²y²+xy