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/20140824/20140824023210519470.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824023210550833.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023210566315.png(  )

2021-09-28

A.17

B.18

C.19

D.20

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