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其妙 发表于 2014-2-3 14:02
$a_n=\frac{b}{a_{n+1}a_{n-1}}$的周期为3 \[f(n)=\frac{b}{f(n+m)f(n-m)}\] 的周期为$3m$ 青青子衿 发表于 2014-2-2 18:17
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