计算﹙xy-x²﹚÷[﹙x-y﹚/xy]
计算﹙xy-x²﹚÷[﹙x-y﹚/xy]
计算[x/﹙xy+y﹚]·[﹙x²+x﹚/x²y]
计算:(xy-x²)×x-y/xy
已知x=3 y=1\3,求3x²y-[2xy²-2﹙xy-3\2x²y﹚+xy]+3xy&
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
[xy(x²-3y)+3xy²]﹙﹣2xy﹚+x³y²﹙2x-y﹚ 其中x=﹣1
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(xy-x²)乘 x-y分之xy
先化简再求值xy﹙x²+y﹚-y²﹙xy+2x﹚-3xy²,其中x=5,y=﹣1
分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
计算(xy-y^2)÷x-y/xy
因式分解.x²y-2xy²+3xy.x²-﹙x+b﹚².x﹙x-3﹚-y﹙3-x