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(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
人气:122 ℃ 时间:2019-10-18 12:27:55
解答
(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
=-x(x-y)÷(x-y)²/xy x (x-y)/x²
=-y
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