Sn-4an

数列{an}满足Sn+Sn+1=5/3an+1,a1=4求an数列{an}满足Sn+Sn+1=5/3an+1,a1=4求an数列{an}满足Sn+Sn+1=5/3an+1,a1=4求anSn+S(n+1)=(5/3)a(n+1)=(5/3)

1、an前n项和为sn,sn=2n^2+1,求an2、数列{an}满足sn=1+1/4*an,求an3、数列{an}满足an=3（n=1）且an=a1+a2+…+an-1(n>=2),求通项4、对任意x属于R,f(x)+f(1-x)=1/2

已知{an}的前n项和为Sn,且an+Sn=4求证：数列{an}是等比数列已知{an}的前n项和为Sn,且an+Sn=4求证：数列{an}是等比数列已知{an}的前n项和为Sn,且an+Sn=4求证：数列{an}是等比数列an+Sn=41a

数列{an}a1=4Sn+Sn+1=5/3an+1求An那些1都是下标数列{an}a1=4Sn+Sn+1=5/3an+1求An那些1都是下标数列{an}a1=4Sn+Sn+1=5/3an+1求An那些1都是下标s(n)+s(n+1)=(5/

数列an各项都是正数,前n项为sn,且an和sn满足4sn=（an+1）^2(n为正整数）,求证an是等差数列,并求an数列an各项都是正数,前n项为sn,且an和sn满足4sn=（an+1）^2(n为正整数）,求证an是等差数列,并求an

设数列{an}的前n项和为Sn,p为常数.同时满足：a1=2且Sn=4（an）+Sn-1-p（an-1）（Sn-1,an-1表示n-1为下标）Sn极限为6则p的值为：an为等比数列,an>0a2a4+a3a5+a4a6=25则a3+a5的值

an是等差数列,求​lim(Sn+Sn+1)/(Sn+Sn-1)lim(Sn+Sn+1)/(Sn+Sn-1)=[n(n+1)/2+(n+1)(n+2)/2]/[n(n+1)/2+n(n-1)/2]=(2n²+4n+2)

等差数列an=4n-16,求Sn最小值等差数列an=4n-16,求Sn最小值等差数列an=4n-16,求Sn最小值an=4n-16=-12+4(n-1)=a1+(n-1)d,a1=-12,d=4.Sn=n×a1+n(n-1)d/2=-12n

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(n+1)=4an+2Sn=4a(n-1

数列an,a1=4,Sn+S(n+1)=5/3an+1,an数列an,a1=4,Sn+S(n+1)=5（a（n+1））/3,求an数列an,a1=4,Sn+S(n+1)=5/3an+1,an数列an,a1=4,Sn+S(n+1)=5（a（n

设数列an的前几项和Sn,对任意正整数n,都有an=5Sn+1成立.记bn=（4+an）/（1-an）（n属于正整数）（1）求数列an与bn的通项公式（2）记cn=b(2n)-b(2n-1),记数列cn的前几项和为Tn,求证：对任意正整数n

有关数列题数列{an}中,a1=4Sn+Sn+1=5除以3倍的an+1,求an这里的an+1都指的是角标小n+1哦!谢谢了有关数列题数列{an}中,a1=4Sn+Sn+1=5除以3倍的an+1,求an这里的an+1都指的是角标小n+1哦!谢

(1/2)设Sn是正项数列【an】的前n项和,4Sn=an^2+2an-3.(1)求数列【an】的通项公式;(2)已知bn=2^n,求Tn=a1(1/2)设Sn是正项数列【an】的前n项和,4Sn=an^2+2an-3.(1)求数列【an】

已知数列{An}的前n项和为Sn,且满足Sn=1/4(An+1)^2,An>0求An需要解题思路答案为An=2n-1已知数列{An}的前n项和为Sn,且满足Sn=1/4(An+1)^2,An>0求An需要解题思路答案为An=2n-1已知数列

设数列an前n项和为sn,an=5sn+1bn=(4+an)/(1-an),记cn=b（2n）-b（2n-1）,求证cn前n项和Tn恒小于1.5设数列an前n项和为sn,an=5sn+1bn=(4+an)/(1-an),记cn=b（2n）-

数列an前n项和Sn满足Sn=1/4(an+1)平方且an>01.求{an}通项2.令bn=20-an,问：数列bn的前多少项和最大?数列an前n项和Sn满足Sn=1/4(an+1)平方且an>01.求{an}通项2.令bn=20-an,问

已知sn为数列an的前n项和,其中满足a1=4,an=3an-1-2,求an及sn已知sn为数列an的前n项和,其中满足a1=4,an=3an-1-2,求an及sn已知sn为数列an的前n项和,其中满足a1=4,an=3an-1-2,求an

设Sn是正项数列【an】的前n项和,4Sn=an^2+2an-3.an=2n+1,已知bn=2^n.求Tn=a1b1+a2b2+…+anbn设Sn是正项数列【an】的前n项和,4Sn=an^2+2an-3.an=2n+1,已知bn=2^n.

设{an}是正项数列,其前n项和Sn满足4Sn=(an-1)(an+3),则数列{an}的通项公式=__设{an}是正项数列,其前n项和Sn满足4Sn=(an-1)(an+3),则数列{an}的通项公式=__设{an}是正项数列,其前n项和

设{an}是正项数列,其前n项和为Sn,满足4Sn=(an-1)(an+3)则数列{an}的通项公式为?附带过程,请帮帮忙。设{an}是正项数列,其前n项和为Sn,满足4Sn=(an-1)(an+3)则数列{an}的通项公式为?附带过程,请