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[几何] 请教一道圆锥曲线的问题

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数学小黄 posted 2013-10-11 08:57 |Read mode
Last edited by hbghlyj 2025-5-10 22:30 QQ截图20131011130221.jpg
P为椭圆上一点
当 $M$ 在椭圆内时
$\frac{1}{e}|PF|+|PM|$ 最小值如图
(1)最大值?
(2)当 $M$ 在椭圆外时 $\frac1e|PF|+|P M|$ 最值?

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其妙 posted 2013-10-11 13:22
搞变式是很好的,但是有一个度吧?
不过,无拘无束,才有可能发现真理?
唉,难办。
妙不可言,不明其妙,不着一字,各释其妙!

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original poster 数学小黄 posted 2013-10-12 19:28
回复 2# 其妙


    学生问到了这问题,不得不回答啊

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力工 posted 2025-5-14 14:33
咋回事?穿越了?怎么在新列表中啊,这不表明是最新回复吗?

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hbghlyj posted 2025-5-14 14:42
力工 wrote at 2025-5-14 07:33
咋回事?穿越了?怎么在新列表中啊,这不表明是最新回复吗?
编辑页面有一个“顶”按钮,如果编辑将上升到顶部,以便提升旧的未解决的问题

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哈哈,我怎么也想不通,最后回复时间还是13年呢。  posted 2025-5-14 17:09

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