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[不等式] 不等式求范围一题

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hongxian posted 2013-12-12 08:44 |Read mode
已知$x$,$y$,$z$为正实数,且$xyz=\lambda$,
求:$\dfrac{1}{\sqrt{1+x}}+\dfrac{1}{\sqrt{1+y}}+\dfrac{1}{\sqrt{1+z}}$的取值范围。

昨天在群内看到,还没有想明白。

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kuing posted 2013-12-12 15:11
群里不是说了的吗?
《一道西部数学奥林匹克赛题的溯源与推广》的结论就可以了

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hbghlyj posted 2023-4-18 06:53
kuing 发表于 2013-12-12 08:11
群里不是说了的吗?
用《一道西部数学奥林匹克赛题的溯源与推广》的结论就可以了 ...
对不起,该文档已被删除

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kuing posted 2023-4-18 12:17
hbghlyj 发表于 2023-4-18 06:53
对不起,该文档已被删除
改为这个链接试试:hkame.org.hk/uploaded_files/magazine/24/248.pdf

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