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[不等式] 不等式答案中的一个等式

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guanmo1 posted 2014-12-22 16:35 |Read mode
如图,该等式咋回事?
一个等式.png

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kuing posted 2014-12-22 17:22
这有什么问题?显然的啊

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original poster guanmo1 posted 2014-12-22 21:28
回复 2# kuing

一眼能看出来吗?

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爪机专用 posted 2014-12-22 22:31

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original poster guanmo1 posted 2014-12-23 15:48
回复 4# 爪机专用


    求明示。

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isee posted 2014-12-23 15:58
回复 5# guanmo1

右把3先约了,心中展开分母中的第一式,再合并即可是左边啊。

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kuing posted 2014-12-23 17:04

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original poster guanmo1 posted 2014-12-24 11:01
回复 6# isee


    对,是的,从右往左看,不好意思

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original poster guanmo1 posted 2014-12-25 10:32
回复 8# guanmo1

很遗憾,钻牛角尖了,等式右边的各个系数3是无用的,确实是显然的,怪我没整体观察一下。

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爪机专用 posted 2014-12-25 20:12
之所以写那些3显然是为了后面放缩方便书写啊,让我写也会这样写

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original poster guanmo1 posted 2014-12-25 22:23
回复 10# 爪机专用


    不写3也一样哦,给别人看,别人更好理解。不至于陷入理解误区,我个人感觉。

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kuing posted 2014-12-25 22:49
作者又怎么会想到这样居然竟然也能产生误区呢?这简直是无法想象不可思议啊……

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