a1=1,a(n+1)=3an-4n+2,证明:数列{an-2n}是等比数列.(2)求数列{an}的前n项和Sn
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已知a1=2 a(n+1)=2an+2^n+3^n 求an
数列{an},a1=3,an*a(n+1)=(1/2)^n,求an
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2an+a(n-1)=3,a1=2
1、在数列{an}中,a1=1.a(n+1)=3an+2n+1.求an.2、在数列{an}中,a1=-1,a(n+1)=(3an-4)/[(an)-1].求an.
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已知数列{an}中,a1=1,an=4a(n-1)+3^n ,求通项an已知数列{an}中,a1=1,an=4a(n-1)+3^n -1,(1)求证数列{an+n+1}是等比数列;(2)求通项an an、4a(n-1)中n、(n-1)为下标