设数列an的前n项和为Sn 已知a1=a ,an+1=Sn+3^n ,若an+1>=an,求a的取值范围
设数列{an}的前n项和为Sn,已知a1=a,an+1=Sn
设数列{an}的前n项和为Sn.已知a1=a,an+1=Sn+3n,n∈N*.由
设数列{an}的前n项和为Sn,已知a1=a,an+1=Sn+3^n,n∈N+.设bn=Sn+3n,求数列{bn}的通项
设数列{an}的前n项和为sn,已知a1=a,an+1=sn+3^n,n∈N* (1)设bn=sn-3^n,求数列{bn
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
设数列{an}的前n项和为Sn,并且满足2Sn=an²+n,an>0.(1)求a1,a2,a3.(2)猜想{a
设数列an的前n项和为Sn,已知a1=1,3an+1=Sn,求数列an的通项公式
设数列An的前n项和为Sn,已知a1=a,an+1=Sn+3n设Bn=Sn-3n次方,求数列Bn的通项公式
一道数学题:设数列{an}的前n项和为Sn.已知a1=a,a(n+1)=Sn+3^n,n属于N*.
一道数学题:设数列{an}的前n项和为Sn.已知a1=a,a(n-1)=Sn+3^n,n属于N.
设数列an的前n项和为Sn,已知a1=1,(2Sn)/n=a(n+1)-1/3n^2-n-2/3
设数列An的前n项和为Sn,已知a1=1,An+1=Sn+3n+1求证数列{An+3}是等比数列