数列an前n项和Sn,满足a1=tSn-(2t+1)S(n-1)=t,t>0,n>=21,证数列an是等比数列.

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已知:数列{an}的首项a1=1,前n项和Sn满足 tSn-(t+1)Sn-1=t(t>0,≥2)求证:数列{an}是等比数列(n-1是角标) 设数列(an)de 首项a1=1,前n项和Sn满足3tSn-(2t+3).Sn-1=3t(t>0,n=1,2,3,4,...)证明数列an是等比数列 设数列an的首项a1=1,前n项和Sn=满足关系式tSn-(t+1)S(n-1)=t (t大于0,n属于N* n大于等于2) 求证:数列an是等比数列 证等比数列an:数列an前n项和Sn,满足a1=tSn-(2t+1)S(n-1)=t,t>0,n>=21,证数列an是等比数列. 数列an前n项和Sn,满足a1=tSn-(2t+1)S(n-1)=t,t>0,n>=21,证数列an是等比数列. 设数列{an}满足a1=t,a2=t^2,前n项和为Sn,且Sn+2-(t+1)Sn+1+tSn=0(n属于N*)(1)证明:数列{an}为等比数列,并求出数列{an}的通项公式(2)当1/2 设数列{an}满足a1=t,a2=t^2,前n项和为Sn,且Sn+2-(t+1)Sn+1+tSn=0(n属于N*)(1)证明:数列{an}为等比数列,并求出数列{an}的通项公式(2)当1/2 设数列an的前n项和为Sn,Sn-tSn-1=n,a1=1(1)t=2,求a2,a3(2){an+1}是等比数列,求t的值(3)求sn 设数列{an}满足a1=t,a2=t的平方,前n项和为Sn,且Sn+2-(t+1)Sn+1+tSn=0设数列{an}满足a1=t,a2=t^2(其中t为非零常数),前n项和为Sn且Sn+2-(t+1)Sn+1+tSn=0(n属于N*)求证1/b1+1/b2+…+1/bn若1/2<t<2,bn=2an/( 设数列{an}的前n项和为Sn,满足Sn-tSn-1=n(n大于等于2,n属于N),t为常数,且a1=1.(1)当t=2时,求a2和a3;(2)若{an +1}是等比数列,求t的值; 设数列{an}的首项a1=1,前n项和Sn满足关系:3tSn-(2t+3)Sn-1=3t(t>0,n=2,3,4,5,).求证:数列{an}是等比数列; 数列{an}的首项a1=1,前n项和Sn满足关系:3tSn-(2t+3)Sn-1=3t(t>0,n=2,3,4,5,).(1)数列{an}是等比数列(要有推理过程);(2)设数列{an}的公比为f(t),做数列{bn},使b1=1,bn=f(1/b(n-1))(n=2,3,4,…),求数列{ 设数列{An}的首项A1=1,前n项和Sn满足关系式:3tSn-(2t+3)Sn-1=3t(t>0,n为自然数n>=2) (1)求证:数列{An}是等比数列; (2)设数列{An}的公比为f(t),作数列{Bn},使B1=1,Bn=f{1/(bn-1)} (n为自然数,n>=2) 数列{an}的首项a1=1,前n项和Sn满足关系:3tSn-(2t+3)Sn-1=3t(t>0,n=2,3,4,5,).求和:b1b2-b2b3+b3b4-b4b5+...+(-1)^n+1bnbn+1.(1)数列{an}是等比数列(要有推理过程);(2)设数列{an}的公比为f(t),做数列{bn}, 高手请帮我解答数列练习题设数列{an}a1=1,前N项的和Sn满足3tSn-(2t+3)Sn-1=3t(t〉0,n=2,3,4…)求证:(1) 数列{an}是等比数列(2) 设{an}公比为f(1/bn-1),作数列{bn}使b1=1,bn=f(1/bn-1)(n=2,3,4…) 设数列{an}的首项a1=1,前n项和Sn满足关系是:3tSn-(2t+3)S(n-1)=3t(t>0,n>=2)(1)求证:数列{an}是等比数列(2)设数列{an}的公比为f(t),作数列{bn},使b1=1,bn=f(1/b(n-1))(n>=2),求数列{bn}的 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的前n项和Sn满足An+2Sn*Sn-1=0,n大于等于2,A1=1/2,求An.