高中数学代数与函数一数列106
题目内容

已知等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824014836641456.png中, http://picflow.koolearn.com/upload/papers/20140824/20140824014836672430.png,前9项和 http://picflow.koolearn.com/upload/papers/20140824/20140824014836688395.png( )

2021-09-28

A.108

B.72

C.36

D.18

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