高中数学代数与函数一数列106
题目内容

设数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022142556481.png的前n项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824022142571388.png，若 http://picflow.koolearn.com/upload/papers/20140824/20140824022142587732.png，则 http://picflow.koolearn.com/upload/papers/20140824/20140824022142602369.png（    ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824022142618362.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824022142634353.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824022142649392.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824022142665391.png

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