x²×(-xy³)×y²-x³×y³×(-y)²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
[-xy/(x-y)²]²×(y²-xy/x)³
-2y³+(3xy²-x²y)-2(xy²-y³)
计算:(-7x²y)(2x²y-3xy³+xy)
-x³y³-x²y²+xy
x³y-2x²y²+xy³
计算:x²y-(2xy²-5x²y)+3xy²-y³
因式分解:(1)x²y-2xy²+y³ (2)(x+2y)²-y²
计算:x•(9x³y-3xy²)/(-3x²y)
化简{-xy/(x-y)²}四次方×(y²-xy/x)³×x四次方/y十次方÷(x/xy-
x⁴+4x³y+6x²y²+4xy³+y⁴=( )