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( x/y - y/x )除以x-y/x结果是
人气:431 ℃ 时间:2020-08-29 06:16:49
解答

(x/y-y/x)÷(x-y)/x
=[(x²-y²)/xy]×x/(x-y)
=(x-y)(x+y)/xy×x/(x-y)
=(x+y)/y
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