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(X+Y分之X+X+Y分之2Y)乘X+2Y分之XY除以(X分之1+Y分之1)要有过程
人气:124 ℃ 时间:2019-08-17 20:20:13
解答
原式=[(x+2y)/(x+y)][xy/(x+2y)]÷[(x+y)/xy]
=[xy/(x+y)]×xy/(x+y)
=x²y²/(x+y)²
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