高中数学代数与函数一数列106
题目内容

设 http://picflow.koolearn.com/upload/papers/20140824/20140824023421856388.png是等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824023421871456.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824023421887297.png项和， http://picflow.koolearn.com/upload/papers/20140824/20140824023421902648.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824023421918395.png（  ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824023421934357.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824023421949338.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824023421965329.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824023421996344.png

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