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不懂那些神马代码,所以就写成这烂模样了,难看莫怪… 睡神 发表于 2013-10-2 12:52
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有两个特解: $f(x)\equiv -1;f(x)\equiv 2$, $f(x)=x+\dfrac{1}{x}$. 007 发表于 2013-10-2 08:29
$f(x)=x^k+\dfrac{1}{x^k}$也符合吧? 其妙 发表于 2013-10-2 16:35
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