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/20140824/20140824022238716481.png的公差 http://picflow.koolearn.com/upload/papers/20140824/20140824022238731321.png≠0, http://picflow.koolearn.com/upload/papers/20140824/20140824022238747513.png.若 http://picflow.koolearn.com/upload/papers/20140824/20140824022238762358.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824022238778315.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824022238794406.png的等比中项,则 http://picflow.koolearn.com/upload/papers/20140824/20140824022238825326.png(   )

2021-09-28

A.3或 -1

B.3或1   

C.3

D.1

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