高中数学代数与函数一数列106
题目内容

设数列 http://picflow.koolearn.com/upload/papers/20140824/20140824015321731461.png是等差数列,其前 http://picflow.koolearn.com/upload/papers/20140824/20140824015321747281.png项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824015321763351.png,若 http://picflow.koolearn.com/upload/papers/20140824/20140824015321778452.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824015321794487.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824015321809361.png(    )

2021-09-28

A.31

B.32

C.33

D.34

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