约分①（x+y）y／xy²③x²+xy／(x+y)²④x²-y²／(x

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约分①（x+y）y／xy²③x²+xy／(x+y)²④x²-y²／(x-y)²求正确答案过程

①（x+y）y／xy²=x+y/xy
③ x²+xy／(x+y)²=x（x+y）/(x+y)²=x/x+y
④ x²-y²／(x-y)²=(x+y)(x-y)/(x-y)²=x+y/(x-y)

x²/xy-x/y 计算：(xy-x²)×x-y/xy 约分：2x²y-2xy²/x²-2xy+y² x-y/x²÷x²-2xy+y²/xy*（xy-x²）约分：x²+y²-9-2xy/x²-y²+6x+9 [-xy/(x-y)²]²×(y²-xy/x)³ 约分（x²-y²）÷（3x²+6xy+3y²） x/xy-y²与y/x²-xy 通分 (x+y)(x²-xy+y²）—xy（x+y）因式分解约分：y-x/x²-y² (xy-x²）²÷（x-y)²/xy·x-y/x² 计算计算：（xy-x²）乘 x-y分之xy