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求导后用 $\ln(1+x)\leqslant x$ 大概就可以了,不过要分一下正负,看上去没什么难度,楼主动过手吗? ... kuing 发表于 2013-10-13 15:52
$\LaTeX$ formula tutorial Reply post To last page
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2025-7-21 12:00 GMT+8
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