高中数学代数与函数一数列106
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824022010141388.png是等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022010157456.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824022010172297.png项和,若 http://picflow.koolearn.com/upload/papers/20140824/20140824022010188590.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824022010203487.png=(     )

2021-09-28

A.

B.

C.

D.http://picflow.koolearn.com/upload/papers/20140824/20140824022010219338.png

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