已知正项等比数列{an}的前n项和为Sn,若S3=3,S9-S6=12,则S6= 发布时间:2017-04-27 18:03 │ 来源:www.tikuol.com 题型:填空题 问题: 已知正项等比数列{an}的前n项和为Sn,若S3=3,S9-S6=12,则S6=______.
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