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通分x+y分之x-y,x-y分之x+y
人气:304 ℃ 时间:2020-05-19 08:12:52
解答
x+y分之x-y=(x-y)²/(x+y)(x-y)
x-y分之x+y=(x+y)²/(x+y)(x-y)
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