高中数学代数与函数一数列106
题目内容

已知等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824020324626481.png的前项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824020324641388.png，且 http://picflow.koolearn.com/upload/papers/20140824/20140824020324657532.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824020324688472.png（  ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824020324704381.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824020324719388.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824020324735356.png

D.

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