高中数学代数与函数一数列106
题目内容

等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824020255064449.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824020255173276.png项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824020255188345.png，若 http://picflow.koolearn.com/upload/papers/20140824/20140824020255220440.png， http://picflow.koolearn.com/upload/papers/20140824/20140824020255235464.png，则 http://picflow.koolearn.com/upload/papers/20140824/20140824020255251375.png等于（　　）

2021-09-28

A.12

B.18

C.24

D.42

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