高中数学代数与函数一数列106
题目内容

若数列 http://picflow.koolearn.com/upload/papers/20140824/20140824015207132480.png的通项为 http://picflow.koolearn.com/upload/papers/20140824/20140824015207148776.png，则其前 http://picflow.koolearn.com/upload/papers/20140824/20140824015207163297.png项和 http://picflow.koolearn.com/upload/papers/20140824/20140824015207194388.png为（    ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824015207210521.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824015207226654.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824015207241669.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824015207272708.png

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