已知数列{an}的首项a1=5,前n项和为Sn, 且Sn+1=2Sn+n+5(n∈N*). (Ⅰ)证明数列{an+1}是等比数列;已知数列{an}的首项a1=5,前n项和为Sn,且Sn+1=2Sn+n+5(n∈N*).(Ⅰ)证明数列{an+1}是等比数列;(Ⅱ
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![已知数列{an}的首项a1=5,前n项和为Sn, 且Sn+1=2Sn+n+5(n∈N*). (Ⅰ)证明数列{an+1}是等比数列;已知数列{an}的首项a1=5,前n项和为Sn,且Sn+1=2Sn+n+5(n∈N*).(Ⅰ)证明数列{an+1}是等比数列;(Ⅱ](/uploads/image/z/1741062-30-2.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%A6%96%E9%A1%B9a1%3D5%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C+%E4%B8%94Sn%2B1%3D2Sn%2Bn%2B5%EF%BC%88n%E2%88%88N%2A%EF%BC%89%EF%BC%8E+%EF%BC%88%E2%85%A0%EF%BC%89%E8%AF%81%E6%98%8E%E6%95%B0%E5%88%97%7Ban%2B1%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%9B%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%A6%96%E9%A1%B9a1%3D5%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94Sn%2B1%3D2Sn%2Bn%2B5%EF%BC%88n%E2%88%88N%2A%EF%BC%89%EF%BC%8E%EF%BC%88%E2%85%A0%EF%BC%89%E8%AF%81%E6%98%8E%E6%95%B0%E5%88%97%7Ban%2B1%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%9B%EF%BC%88%E2%85%A1)
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