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[不等式] 一道不等式

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767056334 posted 2015-2-28 10:10 |Read mode
已知a,b为正实数,且a+b=2,则(a^2+2)/a+b^2/(b+1)的最小值为___________
答案是(3+2根号2)/3 我算是(6+2根号2)/3,求解……

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caijinzhi posted 2015-2-28 13:24
回复 1# 767056334
到底是什么算式!?

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original poster 767056334 posted 2015-2-28 13:36
$$
\frac{a^2+2}{a}+\frac{b^2}{b+1}
$$

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original poster 767056334 posted 2015-2-28 13:36
回复 2# caijinzhi


    $$
\frac{a^2+2}{a}+\frac{b^2}{b+1}
$$

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kuing posted 2015-2-28 14:24
你的答案是正确的
\[\frac{a^2+2}{a}+\frac{b^2}{b+1}
=a+\frac2a+b-1+\frac1{b+1}\]
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其妙 posted 2015-2-28 23:36
回复 5# kuing
又来柯西(变形后的),

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kuing posted 2015-3-1 17:40
回复 6# 其妙

你又不是不知道各种通路,写成均值多么容易

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其妙 posted 2015-3-2 22:41
回复 7# kuing

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