高中数学代数与函数一数列106
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824023204856327.png是等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824023204887169.png{ http://picflow.koolearn.com/upload/papers/20140824/20140824023204903348.png}的前n项和, http://picflow.koolearn.com/upload/papers/20140824/20140824023204919496.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023204934545.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023204934531.png(n>6),则n等于( )

2021-09-28

A.15

B.16

C.17

D.18

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