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[不等式] 两道不等式题

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lemondian posted 2018-6-16 19:07 |Read mode
$(1)已知a,b,c>0,abc=1,求证:\dfrac{a^3}{\sqrt[n]{b+c}}+\dfrac{b^3}{\sqrt[n]{c+a}}+\dfrac{c^3}{\sqrt[n]{a+b}}\geqslant\dfrac{ab+bc+ca}{\sqrt[n]{2}}$。
$(2)已知a,b,c>0,a+b+c\geqslant 3,求证:\dfrac{a^3}{\sqrt[n]{b+c}}+\dfrac{b^3}{\sqrt[n]{c+a}}+\dfrac{c^3}{\sqrt[n]{a+b}}\geqslant\dfrac{a^2+b^2+c^2}{\sqrt[n]{2}}$

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kuing posted 2018-6-16 21:00
n是什么?

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original poster lemondian posted 2018-6-16 21:58
正整数

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