高中数学代数与函数一数列68
题目内容

两数 http://picflow.koolearn.com/upload/papers/20140824/20140824013254165382.png与 http://picflow.koolearn.com/upload/papers/20140824/20140824013254181402.png等差中项是（    ）

2021-09-25

A.http://picflow.koolearn.com/upload/papers/20140824/20140824013254196386.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824013254228344.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824013254243209.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824013254274291.png

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