数列an满足sn=2n-an 计算a1,a2,a3,a4 并猜想通项公式

数列an满足a1=1/3,Sn=n(2n-1)an,求an 数列an满足sn=3an-1/2 计算a1,a2,a3,a4 猜an通项 求an前n项和sn 已知数列{an}满足a1=1/2,sn=n^2an,求通项an 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:a1=3,an=Sn-1+2n,求数列an及sn 数列an满足sn=2n-an 计算a1,a2,a3,a4 并猜想通项公式 数列{an}满足a1=1/2,Sn=n^2an,求通项公式 已知数列an满足a1=1 ,Sn=(n+1)*an/2,求通项 的表达式. 数列an满足a1=2,an+1=2an+2^n,求an和sn 数列a1=3,数列满足2an=Sn乘以S(n-1),求通项公式. 数列an满足a1=1/1*2=1/2,an+1/an=n/n+2 计算a1,a2,a3,a4 猜an通项 求an前n项和sn 已知数列an的前n项和sn与通项an满足a1=2,sn+1sn=an+1,求sn 已知数列{an}中a1=1,且满足an+an-1不等于0,Sn=1/6*(an+1)(an+2).(1)求通项an,并说明{an}是什么数列(2)求数列{an}的前n项和Sn 已知数列{an}a1=2前n项和为Sn 且满足Sn Sn-1=3an 求数列{an}的通项公式an已知数列{an}a1=2前n项和为Sn 且满足Sn +Sn-1=3an 求数列{an}的通项公式an