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[不等式] (zt)$\frac{2x}{2+x}\le \ln{(1+x)}\le \frac{x}{\sqrt{1+x}}$

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realnumber Posted 2016-6-8 21:52 |Read mode

匡书里（3.2）$\frac{2x}{2+x}\le \ln{(1+x)}\le \frac{x}{\sqrt{1+x}}$

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删广告专用 Posted 2016-6-8 21:59

右边 forum.php?mod=redirect&goto=findpost& … d=2517&pid=14498 26#

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耿耿 Posted 2016-8-13 08:22

这是对数函数的含参估计

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