(急)计算(x²-y²/xy)²÷(x+y/y)²·(x/x-y)³
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
(急)计算(x²-y²/xy)²÷(x+y/y)²·(x/x-y)³
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
计算:(xy-x²)乘 x-y分之xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:(xy-x²)×x-y/xy
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算:x•(9x³y-3xy²)/(-3x²y)
计算:(-7x²y)(2x²y-3xy³+xy)
计算,x·(9x³y-3xy²)÷(-3x²y)