高中数学代数与函数一数列106
题目内容

设 http://picflow.koolearn.com/upload/papers/20140824/20140824022909060388.png是等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022909075474.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824022909091297.png项和，若 http://picflow.koolearn.com/upload/papers/20140824/20140824022909106595.png，则 http://picflow.koolearn.com/upload/papers/20140824/20140824022909122478.png（   ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824022909138206.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824022909153223.png

C.

D.http://picflow.koolearn.com/upload/papers/20140824/20140824022909169338.png

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