计算:(3x³y)²*(4y)²÷(2xy)³
计算:(-7x²y)(2x²y-3xy³+xy)
计算:(3x³y)²*(4y)²÷(2xy)³
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
计算 (_2x²y³)²×(4xy²)-¹×(2x²y)
计算:x•(9x³y-3xy²)/(-3x²y)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
-2y³+(3xy²-x²y)-2(xy²-y³)
计算(-3/2xy)(2/3x²-4xy²)+4/3y(3/4x³-1/2x³y