高中数学代数与函数一数列106
题目内容

设 http://picflow.koolearn.com/upload/papers/20140824/20140824015501681388.png为等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824015501696481.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824015501712297.png项和， http://picflow.koolearn.com/upload/papers/20140824/20140824015501728728.png，则 http://picflow.koolearn.com/upload/papers/20140824/20140824015501728345.png=（  ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824015501946302.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824015501962257.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824015501977302.png

D.

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