已知SN是数列{an}前N项和,a1=二分之三,a2=2,且2Sn=A(N+1)+2S(N-1)+1,其中N大于等于2,n属于N.求数列{a(n-1)}是等比数列注:字母后小括号内为角标、N,n均为角标、
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![已知SN是数列{an}前N项和,a1=二分之三,a2=2,且2Sn=A(N+1)+2S(N-1)+1,其中N大于等于2,n属于N.求数列{a(n-1)}是等比数列注:字母后小括号内为角标、N,n均为角标、](/uploads/image/z/10773095-23-5.jpg?t=%E5%B7%B2%E7%9F%A5SN%E6%98%AF%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E5%89%8DN%E9%A1%B9%E5%92%8C%2Ca1%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%89%2Ca2%3D2%2C%E4%B8%942Sn%3DA%EF%BC%88N%2B1%EF%BC%89%2B2S%EF%BC%88N-1%EF%BC%89%2B1%2C%E5%85%B6%E4%B8%ADN%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E2%2Cn%E5%B1%9E%E4%BA%8EN.%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9Ba%28n-1%29%EF%BD%9D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E6%B3%A8%EF%BC%9A%E5%AD%97%E6%AF%8D%E5%90%8E%E5%B0%8F%E6%8B%AC%E5%8F%B7%E5%86%85%E4%B8%BA%E8%A7%92%E6%A0%87%E3%80%81N%2Cn%E5%9D%87%E4%B8%BA%E8%A7%92%E6%A0%87%E3%80%81)
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