若数列an中2sn=an+1

数列an中,a1=1,sn+1=sn-1/2an,则an=?数列an中,a1=1,sn+1=sn-1/2an,则an=?数列an中,a1=1,sn+1=sn-1/2an,则an=?s(n+1)=sn-

“已知数列{an}中,an>0,Sn是数列{An}中的前n项和,且An+1/An=2Sn”An>0,求An“已知数列{an}中,an>0,Sn是数列{An}中的前n项和,且An+1/An=2Sn”An

数列an中,若Sn=-3an+2n,求an数列an中,若Sn=-3an+2n,求an数列an中,若Sn=-3an+2n,求anan=Sn-Sn-1=(-3an+2n)-(-3an-1+2n-2)=-3

数列{an}中,sn表示前n项和.若a1=1,sn+1=4an+2数列{an}中,sn表示前n项和.若a1=1,sn+1=4an+2数列{an}中,sn表示前n项和.若a1=1,sn+1=4an+2S

已知数列{an}中,an＞0,Sn为{an}的前n项和,且an+1/an=2Sn,求an.已知数列{an}中,an＞0,Sn为{an}的前n项和,且an+1/an=2Sn,求an.已知数列{an}中,

已知数列{an}中,an＞0,Sn为{an}的前n项和,且an+1/an=2Sn,求an.已知数列{an}中,an＞0,Sn为{an}的前n项和,且an+1/an=2Sn,求an.已知数列{an}中,

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}中a1=1

已知数列an中,a1=2,前n项和sn,若sn=n^2an,求an已知数列an中,a1=2,前n项和sn,若sn=n^2an,求an已知数列an中,a1=2,前n项和sn,若sn=n^2an,求ans

数列{an}中,已知a1=1,an=2Sn^2/(2Sn-1).求an通项公式数列{an}中,已知a1=1,an=2Sn^2/(2Sn-1).求an通项公式数列{an}中,已知a1=1,an=2Sn^

已知数列an中a1=-2且an+1=sn（n+1为下标）,求an,sn已知数列an中a1=-2且an+1=sn（n+1为下标）,求an,sn已知数列an中a1=-2且an+1=sn（n+1为下标）,求

已知数列an中,a1=-2,an+1=Sn(n∈N+),求an和Sn的表达式已知数列an中,a1=-2,an+1=Sn(n∈N+),求an和Sn的表达式已知数列an中,a1=-2,an+1=Sn(n∈

急在数列{an}中,a1=1,an+1=2an/2+an(n属于自然数)猜想an,并用数学归纳法在数列{an}中,a1=1,an+1=2an/2+an(n属于自然数)猜想an,并用数学归纳法证明若数列

数列｛an｝中,an=-2n+2*(-1)^n,则数列｛an｝的前n项和sn为数列｛an｝中,an=-2n+2*(-1)^n,则数列｛an｝的前n项和sn为数列｛an｝中,an=-2n+2*(-1)^

已知数列{an}中,a2=2,前n项和为Sn,且Sn=n(an+1)/2证明数列{an+1-an}是等差数列已知数列{an}中,a2=2,前n项和为Sn,且Sn=n(an+1)/2证明数列{an+1-

在数列{an}中,a1=2,an=2an-1+2^n+1求an和Sn在数列{an}中,a1=2,an=2an-1+2^n+1求an和Sn在数列{an}中,a1=2,an=2an-1+2^n+1求an和

已知数列{an}中,an>0其前n项和为Sn,且Sn=1/8(an+2)²,求证：数列{an}为等差数列已知数列{an}中,an>0其前n项和为Sn,且Sn=1/8(an+2)²,

已知数列{an}中,an>0,前n项和为Sn,且满足Sn=1/8(an+2)^2.求证数列{an}是等差数列.已知数列{an}中,an>0,前n项和为Sn,且满足Sn=1/8(an+2)^2.求证数列

数列an中,a1=3,an+1=3an,则an=,sn=数列an中,a1=3,an+1=3an,则an=,sn=数列an中,a1=3,an+1=3an,则an=,sn=a(n+1)=3ana(n+1)

已知数列{an}中,an>o,且2Sn=an2+an,求an已知数列{an}中,an>o,且2Sn=an2+an,求an已知数列{an}中,an>o,且2Sn=an2+an,求ann=1时,2S1=2

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数列｛an｝