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通分“1/(x+y)和1/(x-y)”
用初二先最简公分母的方法
人气:470 ℃ 时间:2020-04-19 19:33:38
解答

最简公分母为:(x+y)(x-y)
∴1/(x+y)=(x-y)/(x+y)(x-y)
1/(x-y)=(x+y)/(x+y)(x-y)
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