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[不等式] 分式型平方和的背后

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力工 Posted 2022-10-20 16:57 |Read mode
求$y=x^2+\frac{1}{(x+1)^2}+\frac{(x+1)^2}{x^2}$的最小值。
大佬觉得这道题隐含什么内容。

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色k Posted 2022-10-20 18:16

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真是题也在轮回啊,我才知道早在20年各大神们就讨论过了。  Posted 2022-10-20 20:33
这名字我喜欢

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 Author| 力工 Posted 2022-10-21 12:57
Last edited by 力工 2022-10-21 13:04类似题:
已知$x>0,y>0$,求$(x+y)^2+\frac{1}{(x+y)^2}+\frac{1}{y^2}+\frac{1}{x^2}$的最小值。

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比上一题简单很多  Posted 2022-10-21 14:06

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kuing Posted 2022-10-21 14:39
力工 发表于 2022-10-21 12:57
类似题:
已知$x>0,y>0$,求$(x+y)^2+\frac{1}{(x+y)^2}+\frac{1}{y^2}+\frac{1}{x^2}$的最小值。 ...
一点都不类似,根本是两类题,难度也不在一个级别。

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