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[不等式] 一个不等式小题,推广?

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realnumber posted 2013-12-25 09:41 |Read mode
$a_1,a_2,b_1,b_2\in R^+,a_1+a_2=2a,b_1+b_2=2b$,求证:$(\frac{1}{a_1}+\frac{1}{b_1})(\frac{1}{a_2}+\frac{1}{b_2})\ge (\frac{1}{a}+\frac{1}{b})^2$

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original poster realnumber posted 2013-12-25 09:52

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kuing posted 2013-12-25 16:39
都很简单啊,有什么好玩嘀?

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original poster realnumber posted 2013-12-26 09:17
en  ,至少样子还好看,适合初学者吧,

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其妙 posted 2013-12-26 23:46
回复 4# realnumber
k12的那个写的挺乱的,估计多数人没时间认真看了。

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爪机专用 posted 2013-12-27 01:47
回复 5# 其妙

K12也使用mathjax,但是没什么人用

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