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[不等式] 奇怪的一道分式的最小值

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敬畏数学 posted 2021-9-7 10:55 |Read mode
$ a>0,b>0,a(1-a)+(a-b)^2=a^3+b^3 $,则$ \dfrac{2a^2}{a+3b} +\dfrac{2b^2}{3a+b}$的最小值_____.

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色k posted 2021-9-7 11:12
条件吓吓人而已,实际上可分解为 (a + b - 1) (a + a^2 - a b + b^2) = 0

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original poster 敬畏数学 posted 2021-9-8 09:37
Last edited by 敬畏数学 2021-9-8 10:06ok!谢谢。forum.php?mod=viewthread&tid=8144&extra=page=2

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