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[不等式] 求根式和的最小值

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lemondian posted 2019-5-8 11:43 |Read mode
已知正数$a,b$满足$a+b=1$,求$K=\sqrt{1+2a^2}+\sqrt{(\frac{5}{12})^2+b^2}$的最小值。

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kuing posted 2019-5-8 13:36
扔掉型三次方程

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敬畏数学 posted 2019-5-8 13:44
题搞错。做很久没有结果。$k=\sqrt{1+2a^2}+2\sqrt{(\frac{5}{12})^2+b^2}$

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kuing posted 2019-5-8 13:49
反正无非就和这帖一样:forum.php?mod=redirect&goto=findpost& … d=4447&pid=21058(16# 划重点)楼主抄错属于(1),楼上修改后属于(2)

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original poster lemondian posted 2019-5-8 16:06
回复 3# 敬畏数学
该死,我还重看一次,还是写错了,你是对的

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Shiki posted 2019-5-9 00:12
回复 4# kuing

k神,这个取等是怎么来的啊...

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色k posted 2019-5-9 01:00

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