(2x²y)³(-4xy²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
-2y³+(3xy²-x²y)-2(xy²-y³)
计算:(-7x²y)(2x²y-3xy³+xy)
(2x²y)³(-4xy²)
(-2/3X³y+4x²y²-1/2xy²)/(-xy/4) 急
﹙4x³y²-2x⁴y²-½xy)÷(-1/2xy) (^人^)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
计算:x²y-(2xy²-5x²y)+3xy²-y³
已知(4x-2y-1)²+根号(xy-2)=0,求4x³y-4x²y²+xy