设数列{an}的前n项和为Sn=3n^2-65n 求数列{IanI}的前n项和 Tn

数列｛an｝,中,a1=1/3,设Sn为数列｛an｝的前n项和,Sn=n（2n-1）an 求Sn 设数列an的前n项和为Sn,若Sn=1-2an/3,则an= 设数列{an}的前n项和为sn=n^2,求a8 求:设数列 {an}的前n项和为Sn,数列{Sn}的前n项和为Tn,满足Tn=2Sn一n²,n∈求:设数列 {an}的前n项和为Sn,数列{Sn}的前n项和为Tn,满足Tn=2Sn一n²,n∈N 设数列{an}的前n项和为Sn=3n^2-65n 求数列{IanI}的前n项和 Tn 设数列{an}的前n项和为Sn,若Sn=1-2/3an,n∈N*,则an= 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 已知数列an的前n项和Sn=n^2,设bn=an/3^n,记数列bn的前n项和为Tn. 设数列{an}的前n项和Sn=2(an-3),证明{an}为等比数列,并求通项公式 3 数列｛an｝的通项公式an=(-1)^(n-1)*2n(n属于N*)设其前n项和为Sn,则S100= 设数列an的首项a1等于1,前n项和为sn,sn+1=2n设数列an的首项a1等于1，前n项和为sn，sn+1=2n 已知数列{an}的通项公式an=log2[(n+1)/(n+2)](n∈N),设其前n项的和为Sn,则使Sn 设数列｛an}的前n项和为Sn,已知首项a1=3,且Sn+1+Sn=2an+1,试求此数列的通项公式an及前n项和Sn 已知数列{an}的前N项和为Sn 且an+1=Sn-n+3,a1=2,设Bn=n/Sn-n+2前N项和为Tn 求证Tn 小于4/3 设数列{an}的前n项和为Sn,已知ban-2n=(b-1)Sn 已知数列{an}的前n项和为Sn,an+Sn=2,（n 设数列｛an｝的前n项和为sn,已知a1=a,an+1=Sn+3^n,n属于N*.)设数列｛an｝的前n项和为sn,已知a1=a,an+1=Sn+3^n,n属于N*.(1)设bn=Sn-3^n,求数列｛bn｝通项公式；(2)若an+1>=an,n属于N*,求a的取值范围....Thanks.... 已知数列an的前n项和为Sn,且An=3^n+2n,则Sn等于