在数列｛an}中,a1=2,a(n+1)=an+2^n+1?(1)求证：数列｛an-2^n}为等差数列；?(2)设...

在数列｛an}中,a1=2,a(n+1)=an+2^n+1?(1)求证：数列｛an-2^n}为等差数列；?(2)设... 设数列an的前n项和为Sn,a1=1,an=(Sn/n)+2(n-1)(n∈N*) 求证:数列an为等差数列, 已知数列{an}中a1=-1且(n+1)an,(n+2)an+1(是下标)成等差数列,设bn=(n+1)an-n+2求证 设数列{an},a1=3,a(n+1)=3an -2 (1)求证:数列{an-1}为等比数列 设数列{an}中,a1=2,a(n+1)=an+n+1,求an 在数列{an}中,a1=1,An+1=1-1/4an,bn=1/2an-1,其中n∈N*求证{bn}为等差数列 设数列 an 的前n项和为Sn,a1=1,an=Sn/n+2(n-1)(n∈N*) 求证:数列{an}为等差数列,并求a 已知数列{an}满足an+an+1=2n+1（n∈N*），求证：数列{an}为等差数列的充要条件是a1=1． 已知数列{An}满足A1=1,An+1=2An+2^n.求证数列An/2是等差数列 已知数列{an}满足a1=3 an*a(n-1)=2a(n-1)-1,求证数列{1/(an-1)}是等差数列,并求出数列 设数列{an}中,a1=2,an+1=an+n+1,则通项an=? 在数列{an}中,a1=1,an+1=(1+1/n)an+(n+1)/(2^n) (1) 设bn=an/n,求数列{bn