x-y/x²÷x²-2xy+y²/xy*（xy-x²）
人气：351 ℃ 时间：2019-10-24 06:41:00
解答
(x-y)/x²÷(x²-2xy+y²)/xy×(xy-x²)=(x-y)/x²÷(x+y)²/xy×x(y-x)=(x-y)²/x²×xy/(x+y)²×x(y-x)=-(x-y)³/(x+y)²
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