数列an的前n项和为Sn,a1=1,an+1=2Sn 设bn=log3an,求数列bn的前n项和Tn

已知数列{an}的前n项和为Sn,a1=1,a（n+1）=1+2Sn.设bn=n/an,求证:数列{bn}的前n项和Tn 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 数列an的前n项和为Sn,Sn=2an-1,数列bn满足b1=2,bn+1=an+bn.求数列bn的前n项和Tn 数列{an},a1=1,an=2-2Sn,求an,若bn=n*an,求{bn}的前n项和Tn 数列{an}的前n项和为Sn=3an+2 设bn=n 求数列{an·bn}的和Tn an=2的n-1次方,bn=2n-1,设数列an的前n项和为sn,求数列{sn.bn}的前n项和Tn 数列an,满足Sn=n^2+2n+1,设bn=an*2^n,求bn的前n项和Tn 设bn=(an+1/an)^2求数列bn的前n项和Tn 已知数列{an}前n项和Sn=n^2+n,令bn=1/anan+1,求数列{bn}的前n项和Tn 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. 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 已知数列an的前n项和Sn=n^2,设bn=an/3n,记数列bn的前n项和为Tn