计算 (-3xy²)²·(2x²y)³+(-2x²y²)
计算:(-7x²y)(2x²y-3xy³+xy)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(xy-x²)×x-y/xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算x²y³-2x(4xy³)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:2x+2y分之3y + x²+xy分之2xy
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)