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[不等式] 不等式猜想 已被否定

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facebooker posted 2019-12-13 22:52 |Read mode
Last edited by facebooker 2019-12-14 13:58已知:$a,b,c>0.a+b+c\geqslant \dfrac{3}{2}$,证明或否定:$\dfrac{a}{a+bc}+\dfrac{b}{b+ca}+\dfrac{c}{c+ab}\geqslant \dfrac{9}{3+a+b+c}$

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kuing posted 2019-12-14 00:16
讨厌的标题党

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kuing posted 2019-12-14 00:29
已知:$a,b,c>0.a+b+c\geqslant \dfrac{3}{2}$,证明或否定:$\dfrac{a}{a+bc}+\dfrac{b}{b+ca}+\dfrac{c}{c+ab}\geqslant \dfrac{9}{3+a+b+c}$
facebooker 发表于 2019-12-13 22:52
而且还是不成立的!try: a=3/4,b=1/2,c=1/2

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original poster facebooker posted 2019-12-14 00:38
回复 3# kuing

谢谢。

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青青子衿 posted 2019-12-14 12:03
回复 4# facebooker
改了吧!

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