高中数学代数与函数一数列106
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824014812383388.png是等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824014812414456.png的前n项和,若 http://picflow.koolearn.com/upload/papers/20140824/20140824014812430687.png,则数列 http://picflow.koolearn.com/upload/papers/20140824/20140824014812414456.png的通项公式为(  )

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824014812476348.png=2n-3

B.http://picflow.koolearn.com/upload/papers/20140824/20140824014812476348.png=2n-1

C.http://picflow.koolearn.com/upload/papers/20140824/20140824014812476348.png=2n+1

D.http://picflow.koolearn.com/upload/papers/20140824/20140824014812476348.png=2n+3

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