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等比数列,帮我解一下，急

设等比数列{an}的前n项和为Sn,S4=1,S8=17,则通项an=____

回复(1) 2010-08-01 18:41 来自版块 -

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: M646342881：解答见附件：(2010-08-01 20:31)

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