用辅助数列法解等差数列不要用递推公式把它推出来,用辅助数列法,1、已知数列{an}的首项a(1) =1,且an=2a(n-1)+1 n>=2,则a(5)为?2、已知a(1)=2,a(n+1) =2an+3,n为非零自然数,求a(5) 3、数列{an}中,a(1)=
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![用辅助数列法解等差数列不要用递推公式把它推出来,用辅助数列法,1、已知数列{an}的首项a(1) =1,且an=2a(n-1)+1 n>=2,则a(5)为?2、已知a(1)=2,a(n+1) =2an+3,n为非零自然数,求a(5) 3、数列{an}中,a(1)=](/uploads/image/z/817189-61-9.jpg?t=%E7%94%A8%E8%BE%85%E5%8A%A9%E6%95%B0%E5%88%97%E6%B3%95%E8%A7%A3%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%8D%E8%A6%81%E7%94%A8%E9%80%92%E6%8E%A8%E5%85%AC%E5%BC%8F%E6%8A%8A%E5%AE%83%E6%8E%A8%E5%87%BA%E6%9D%A5%2C%E7%94%A8%E8%BE%85%E5%8A%A9%E6%95%B0%E5%88%97%E6%B3%95%2C1%E3%80%81%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%A6%96%E9%A1%B9a%281%29+%3D1%2C%E4%B8%94an%EF%BC%9D2a%28n-1%29%EF%BC%8B1+n%EF%BC%9E%EF%BC%9D2%2C%E5%88%99a%285%29%E4%B8%BA%3F2%E3%80%81%E5%B7%B2%E7%9F%A5a%281%29%3D2%2Ca%28n%2B1%29+%3D2an%EF%BC%8B3%2Cn%E4%B8%BA%E9%9D%9E%E9%9B%B6%E8%87%AA%E7%84%B6%E6%95%B0%2C%E6%B1%82a%285%29+3%E3%80%81%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca%281%29%3D)
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