有关4T9的精选大全

等比数列{an}是递减数列,其前n项的积为Tn,若T13=4T9,则a8·a15等于(   )A.±2    ...
问题详情:等比数列{an}是递减数列,其前n项的积为Tn,若T13=4T9,则a8·a15等于(   )A.±2                 B.±4                 C.2                     ...
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