计算:6x²y·(-4xy³);(-2x²)²·(-3x³y).
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算:(-7x²y)(2x²y-3xy³+xy)
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(-x)²x³·(-2y)³-(-2xy)²·(-3x)³y.
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算:x•(9x³y-3xy²)/(-3x²y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:6x²y·(-4xy³);(-2x²)²·(-3x³y).
计算,x·(9x³y-3xy²)÷(-3x²y)
(x²-y²)·6x/3xy-3x²计算