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已知等比数列 http://picflow.koolearn.com/upload/papers/20140824/20140824022000422480.png的首项 http://picflow.koolearn.com/upload/papers/20140824/20140824022000422391.png公比 http://picflow.koolearn.com/upload/papers/20140824/20140824022000438432.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824022000453749.png(     )

发布时间:2021-09-28

A.50

B.35

C.55

D.46

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