高中数学代数与函数一数列106
题目内容

设等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021914839456.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824021914854297.png项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824021914870388.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824021914886503.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824021914901554.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824021914917428.png(     )

2021-09-28

A.90

B.100

C.110

D.120

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