高中数学代数与函数一数列106
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824020503140457.png是等差数列,若 http://picflow.koolearn.com/upload/papers/20140824/20140824020503155591.png,则数列 http://picflow.koolearn.com/upload/papers/20140824/20140824020503140457.png前8项的和为(   )

2021-09-28

A.128

B.80

C.64

D.56

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