a6a7a8的知识精选

设{an}是等比数列,若a1+a2+a3=1,a2+a3+a4=2,则a6+a7+a8=(   )A.6   ...
问题详情:设{an}是等比数列,若a1+a2+a3=1,a2+a3+a4=2,则a6+a7+a8=(   )A.6                          B.16                         C.32             ...
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