题目

{an}是由正数组成的等比数列,公比q=2且a1a2a3…a30=230,那么a3a6a9…a30等于(    )A.210              B.230                C.215              D.216 答案：B解析:a1a2a3=,a4a5a6= ,…,有a1a2…a30==230,∴(a3a6…a30)3=230·230.∴a3a6…a30=230.

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