高中数学代数与函数一数列106
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824022201010388.png为等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022201026456.png的前 http://picflow.koolearn.com/upload/papers/20140824/20140824022201042297.png项和, http://picflow.koolearn.com/upload/papers/20140824/20140824022201057472.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824022201073387.png,正项等比数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022201088471.png中, http://picflow.koolearn.com/upload/papers/20140824/20140824022201088560.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824022201260606.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824022201276553.png=(     )

2021-09-28

A.8

B.9

C.10

D.11

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