高中数学代数与函数一数列107
题目内容

设等差数列{a n}的前n项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824023151066388.png,若 http://picflow.koolearn.com/upload/papers/20140824/20140824023151081414.png， http://picflow.koolearn.com/upload/papers/20140824/20140824023151097526.png, 则当 http://picflow.koolearn.com/upload/papers/20140824/20140824023151066388.png取最大值 http://picflow.koolearn.com/upload/papers/20140824/20140824023151128297.png等于（    ）                                                    

2021-09-28

A.4

B.5

C.6

D.7

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