悠闲数学娱乐论坛(第3版)»论坛 › 数学区 › 初等数学讨论 › 圆锥曲线中得到的最值问题

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[不等式] 圆锥曲线中得到的最值问题

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hjfmhh Post time 2015-5-25 22:54 |Read mode

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Author| hjfmhh Post time 2015-5-25 22:54

求最大值

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kuing Post time 2015-5-25 23:02

$(1+9k^2)(9+k^2)=9(1+k^2)^2+64k^2$

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Author| hjfmhh Post time 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

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活着＆存在

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活着＆存在 Post time 2015-5-26 12:44

回复 4# hjfmhh

已经可以了呀

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kuing Post time 2015-5-26 12:52

回复 4# hjfmhh

我在3楼白回复了吗？

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isee Post time 2015-5-26 19:59

回复 6# kuing

楼主没有明白你的意思

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Author| hjfmhh Post time 2015-5-26 21:30

明白了kuing,均值一下就出来了

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