计算(2x-1)(x²-xy+2y²)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算 (x²+2xy+y²)(x²-xy+y²)²
计算:(-7x²y)(2x²y-3xy³+xy)
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:(xy-x²)乘 x-y分之xy
计算:3xy[2xy-x(y-2)+x]
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x