高中数学代数与函数一数列106
题目内容

公差不为零的等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824014813428456.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824014813459297.png项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824014813475388.png.若 http://picflow.koolearn.com/upload/papers/20140824/20140824014813490334.png是 http://picflow.koolearn.com/upload/papers/20140824/20140824014813522454.png的等比中项, http://picflow.koolearn.com/upload/papers/20140824/20140824014813537526.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824014813568399.png等于（）

2021-09-28

A.18

B.24

C.60

D.90

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