设等比数列{an}的公比q=2,前n项和和为Sn,则S4/a2的解法?请详略的合适!
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![设等比数列{an}的公比q=2,前n项和和为Sn,则S4/a2的解法?请详略的合适!](/uploads/image/z/11522448-0-8.jpg?t=%E8%AE%BE%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%85%AC%E6%AF%94q%3D2%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%92%8C%E4%B8%BASn%2C%E5%88%99S4%2Fa2%E7%9A%84%E8%A7%A3%E6%B3%95%3F%E8%AF%B7%E8%AF%A6%E7%95%A5%E7%9A%84%E5%90%88%E9%80%82%21)
设等比数列{an}的公比q=2,前n项和和为Sn,则S4/a2的解法?请详略的合适!
设等比数列{an}的公比q=2,前n项和和为Sn,则S4/a2的解法?请详略的合适!
设等比数列{an}的公比q=2,前n项和和为Sn,则S4/a2的解法?请详略的合适!
设a1=a,则a2=2a,a3=4a,a4=8a,s4=15a,答案为7.5