(-x)∧5×(xy)²×x³y=?
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
计算:(xy-x²)乘 x-y分之xy
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
计算:(-7x²y)(2x²y-3xy³+xy)
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
无论x,y取何值时,代数式:(x³+3x²y-5xy+6y³)+(y³+2xy&
(x+y)(x²-xy+y²)—xy(x+y)因式分解
化简{-xy/(x-y)²}四次方×(y²-xy/x)³×x四次方/y十次方÷(x/xy-