1anan的知识精选

在正项等比数列{an}中,已知a1a2a3=4,a4a5a6=12,an-1anan+1=324,则n等于( ...
问题详情:在正项等比数列{an}中,已知a1a2a3=4,a4a5a6=12,an-1anan+1=324,则n等于()A.12                                        B.13C.14                      ...
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