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[几何] 2015泰州高三期末三角试题

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aishuxue posted 2015-2-7 10:15 |Read mode
Last edited by hbghlyj 2025-3-22 00:00在 $\triangle A B C$ 中,角 $A, B, C$ 所对的边分别为 $a, b, c$ ,若 $\angle B=\angle C$ 且 $7 a^2+b^2+c^2=4 \sqrt{3}$ ,则 $\triangle A B C$ 面积的最大值为

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Tesla35 posted 2015-2-7 12:06
$\frac{\sqrt{5}}{5}$均值不等式一步搞定。有啥难的

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luren8asdf posted 2015-2-7 21:24
我算出答案是$\sqrt{5}/5$
但是方法比较麻烦

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test posted 2015-2-7 22:46
585撸个过程吧

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其妙 posted 2015-2-10 21:47

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test posted 2015-2-10 23:02
回复 6# 其妙

擦,博客党……
题目居然有两个版本,真逗,不过你看了他的解法吗?(没有 b=c 的版本)

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