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[不等式] 不等式证明

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guanmo1 Posted 2014-12-26 11:00 |Read mode

如图，

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Author| guanmo1 Posted 2014-12-26 11:26

知道了，放缩为xi的倒数和，用n元均值，得到＞n^2, 注意到n≥2即可。

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kuing Posted 2014-12-26 13:31

这也太水了，仅仅前两项和就已经 $\ge 16/3=5.333...$

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Author| guanmo1 Posted 2014-12-26 16:15

回复 3# kuing

是水，所以……

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