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已知等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021513054456.png中, http://picflow.koolearn.com/upload/papers/20140824/20140824021513070427.png , http://picflow.koolearn.com/upload/papers/20140824/20140824021513085406.png,则前10项和 http://picflow.koolearn.com/upload/papers/20140824/20140824021513101410.png(  ) 

发布时间:2021-09-28

A.55

B.155

C.350

D.400

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