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请教这个是怎么得出的结果？

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大王八 Posted at 2013-10-22 01:43:55 |Read mode

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为什么会是根号2？

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Author| 大王八 Posted at 2013-10-22 01:55:16

3和9之间应该有什么猫腻。

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isee Posted at 2013-10-22 08:03:15

回复 2# 大王八

换底公式

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