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[几何] 边成等差数列,角的正弦值最小值

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敬畏数学 posted 2019-5-5 09:25 |Read mode
在△ABC中,角A,B,C对的边分别为a,b,c,且$\sqrt{2} a,b,c$成等差数列,求$\frac{3}{\sin A}+\frac{2}{\sin C}$的最小值.

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色k posted 2019-5-5 10:46

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isee posted 2019-5-5 11:41
等差数列 原来是 等差數列 难怪我没搜索到的

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original poster 敬畏数学 posted 2019-5-5 11:58
回复 2# 色k
好像以前见过,没有搜素一下。

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kuing posted 2019-5-5 13:28
回复 3# isee

我是记得发帖人,所以直接进他的个人主页在他的所有主题里就找到了

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kuing posted 2019-5-5 13:29
回复 4# 敬畏数学

仔细看才发现,原来两道题是不同的不知方法能不能照用,晚点再试试

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kuing posted 2019-5-5 14:25
噢,经测试,本帖的题目已然涉高次方程了,所以数据一定是要凑好的,随便改没得玩。

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