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[不等式] 菜鸟求解答

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qinxianming82 posted 2016-6-16 15:44 |Read mode
Last edited by qinxianming82 2016-6-20 16:57设a,b,c,d$>=0$,$(a+2b)/(2c+3d)+(b+2c)/(2d+3a)+(c+2d)/(2a+3b)+(d+2a)/(2b+3c)>=7/3$

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f(x) posted 2016-6-16 22:56
$a,b,c,d\geqslant0$?分母能够等于零呀?

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original poster qinxianming82 posted 2016-6-17 17:22
对,取等条件是(1,0,1,0)

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kuing posted 2016-6-17 17:43
检查最后两项的分母

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original poster qinxianming82 posted 2016-6-20 16:43
是轮换和,我打错了!

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original poster qinxianming82 posted 2016-6-20 16:57
我改过来了

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original poster qinxianming82 posted 2016-6-20 16:59
影响各位解答了

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