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[不等式] 求有限制条件的二元最小值

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lemondian posted 2024-11-10 18:08 |Read mode

已知正数$x,y$满足$\sqrt{9x^2-1}+\sqrt{9y^2-1}=9xy$，求$4x^2+y^2$的最小值。

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kuing posted 2024-11-10 18:11

一个月前的帖子就有：
forum.php?mod=viewthread&tid=12806

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N posted 2024-11-10 18:17

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