知数列Sn=2An-2n求An

知数列Sn=2An-2n求An “已知数列{an}中,an>0,Sn是数列{An}中的前n项和,且An+1/An=2Sn”An>0,求An 已知数列an=n^2-n+2,求Sn 一个数列问题已知数列an前n项为sn,满足an+sn=2n.求an 数列an满足a1=1/3,Sn=n(2n-1)an,求an 已知数列{an}满足:a1=3,an=Sn-1+2n,求数列an及sn 一道关于数列 已知数列{An}的前n项和为Sn,Sn=3+2An,求An 数列{an}前n项和为Sn,且2Sn+1=3an,求an及Sn 数列An=n的2次方 求Sn 已知数列{an},满足a1=1/2,Sn=n²×an,求an 已知数列an满足a1=1/2 sn=n平方×an 求an 已知数列An满足 A1=1/2 Sn=N²An 求An 数列{An}满足Sn=n^2An,若A1=1005,求An的表达式? 已知数列an满足a1=1 Sn=2an+n 求an 已知数列{an}满足Sn+an=2n+1.求an 数列an中,若Sn=-3an+2n,求an 数列an,前n项和Sn=-2an+3 求an 数列{an}的通项公式an=n(n+1)/2,求数列{an}的前n项和Sn.注意：是求Sn,已知an