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[理工] 递回

楼主: tiger1029 (日向)   2020-02-13 00:04:25
https://i.imgur.com/RxG38SD.jpg
问一下这题怎算
作者: bochengchen (LFII)   2020-02-13 00:23:00
同时除掉n(n+1)
作者: ken2812221 (李俊宽)   2020-02-13 00:46:00
bn = an / (n+1)bn - bn-1 = 1/n -1/(n+1)bn = bn-1 + 1/n - 1/(n+1)bn = bn-2 + 1/(n-1) - 1/(n+1)bn = b0 + 1/1 - 1/(n+1)bn = 2 - 1/(n+1)an = 2n + 1
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