a1=1,a（n+1）=2an,n=1,2,3,.求Sn

已知数列an满足a1=2,an=a(n-1)+2n,（n≥2）,求an 已知数列{an}满足a1=33,a（n+1）-an=2n,求an/n的最小值 a1=1,a(n+1)=2an+n^2+2n +2 求an A1=1,A(n+1)/An=(n+2)/n,求An? 已知a1=2 a(n+1)=2an+2^n+3^n 求an a1=2,a（n+1）（角标）=an+3n,求an 已知A1=2,An=3A（n-1）+2n ,求通项公式 an 已知数列{a}满足a1=1/2,a（n+1）=an+1/(n^2+n),求an已知数列{a}满足a1=1/2,a（n+1）=an+1/(n^2+n),求an 1.a1=1 an=a1+2a2+.(n-1)an-1求an2.an+a（n+1）=1/2,a1=1,求an 数列{an},a1=3,an*a(n+1)=(1/2)^n,求an 数列{an}满足a1=2,a(n+1)=2an+n+2,求an 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an 若数列{an},a1=2/3,且a（n+1）=an+1/【（n+2）（n+1）】,（n∈N+）则通项an=? 1.a1=3 且 a（n+1）=an+5ana（n+1）2.a1=1 且 a（n+1）=an+2n+13.a1=1 且 a（n+1）=an+1/4n^2-14.a1=1 an=n+1/n*a（n+1）求各题的an 已知数列{an}中：（1)a1=2,an=2a(n-1)+2^n+1(n>=2,n∈N*）求an;(2)a1=1,a(n+1)=3an+2(n∈n*）,求an第一问a1=2,an=2a(n-1)+2^(n+1) 已知数列{an}满足a1=2,a(n+1)-an=a(n+1）*an,则a31=? 数列[An]满足a1=2,a（n+1）=3an-2 求an 已知数列{an}满足：a1=1,an=a1+2a2+3a3+``````+(n-1)a(n-1)(n大于等于2）,则通项公式an是什么?