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[数列] 递推数列,求和

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guanmo1 posted 2018-3-29 09:11 |Read mode
Last edited by guanmo1 2018-3-29 09:57 递推数列,求和.png ,首项为1/2。

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色k posted 2018-3-29 10:02
递推式两边+1然后倒数即得裂项式。

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敬畏数学 posted 2018-3-29 10:06
回复 1# guanmo1
套路题,哎!两边+1,裂项后搞出相邻两项的倒数和,将此数列的通项分子变成常数!除了套路还是套路。。。。。,说实话这些题记得我的头晕!

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