设数列{An}的前n项和Sn=An-1(n=1,2,3…),数列{bn}满足条件b1=3,bk+1=Ak+bk(k=1,2,3)
问题描述:
设数列{An}的前n项和Sn=An-1(n=1,2,3…),数列{bn}满足条件b1=3,bk+1=Ak+bk(k=1,2,3)
求数列bn的前n项和sn‘
(2)设cn=3/(n+2)(Sn’-Sn),且数列cn的前n项和为Tn,求证Tn
错了,求证Tn
答
3587967867