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[不等式] 圆锥曲线中得到的最值问题

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hjfmhh posted 2015-5-25 22:54 |Read mode
7}M9N4G6JKE`TBZ}2XAXPCB.png

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original poster hjfmhh posted 2015-5-25 22:54
求最大值

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kuing posted 2015-5-25 23:02
$(1+9k^2)(9+k^2)=9(1+k^2)^2+64k^2$

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original poster hjfmhh posted 2015-5-26 12:20
分子中有|k|还是不好处理,我通过求导算出最大值1/48但太复杂了,是否有用不等式技巧解呢
活着&存在 posted 2015-5-26 12:44
回复 4# hjfmhh


    已经可以了呀

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kuing posted 2015-5-26 12:52
回复 4# hjfmhh

我在3楼白回复了吗?

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isee posted 2015-5-26 19:59
回复 6# kuing


    楼主没有明白你的意思

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original poster hjfmhh posted 2015-5-26 21:30
明白了kuing,均值一下就出来了

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