计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(xy-x²)×x-y/xy
计算:(-7x²y)(2x²y-3xy³+xy)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算x²y³-2x(4xy³)
计算:(-3x²y²)²•(2xy)³÷(xy)²
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(-x²+2xy-y的平方)-2(xy—3x²)+3(2y的平方-xy) 计算.