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一类奇特的函数方程

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青青子衿 Posted at 2013-12-20 20:56:28 |Read mode
\[\sum_{i=1}^{n}f(\frac{i}{1+i})=f(\frac{n}{n+1})\]

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战巡 Posted at 2013-12-21 05:24:51
回复 1# 青青子衿

这有啥奇特的......只是楼主自己把它搞奇特了

\[\sum_{i=1}^n f(\frac{i}{i+1})=\sum_{i=1}^{n-1} f(\frac{i}{i+1})+f(\frac{n}{n+1})=f(\frac{n-1}{n})+f(\frac{n}{n+1})=f(\frac{n}{n+1})\]
\[f(\frac{n-1}{n})=0\]
满足上式对任意$n>1, n\in N^+$都成立的函数都行

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