高中数学代数与函数一数列106
题目内容

已知 http://picflow.koolearn.com/upload/papers/20140824/20140824023211595481.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023211611491.png均为等差数列,其前 http://picflow.koolearn.com/upload/papers/20140824/20140824023211627297.png项和分别为 http://picflow.koolearn.com/upload/papers/20140824/20140824023211642388.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023211658373.png,若 http://picflow.koolearn.com/upload/papers/20140824/20140824023211673849.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824023211689519.png值是( )

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824023211705362.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824023211720291.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824023211720448.png

D.

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