已知数列{an}满足2a(n+1)=an+a(n+2)(n∈N*),它的前n项和为sn,且a3=5,s6=36,

已知数列{an}满足2a(n+1)=an+a(n+2)(n∈N*),它的前n项和为sn,且a3=5,s6=36, 已知数列{an}满足2an+1=an+an+2（n∈N*），它的前n项和为Sn，且a3=-6，S6=-30．求数列{an 已知数列{an}满足2an+1=an+an+2（n∈N*），它的前n项和为Sn，且a3=10，S6=72．若bn=12 已知数列{an}满足2an+1=an+an+2（n=1，2，3，…），它的前n项和为Sn，且a3=5，S6=36． 已知数列{an}满足2a（n+1）（下脚标）=an+a（n+2）（下脚标）（n∈N＋）它的前n项和为Sn,且a3=10, 已知等差数列{An}的前n项和为Sn,且A3=6,S6=42.且满足A(n+2)＝2A(n+1)－An 设数列an的前n项和为sn,满足2Sn=a（n+1）-2^(n+1)+1,n∈N,且a1,a2+5,a3成等差数列 已知数列{a(n)}Sn是其前n项的和,且满足3an=2Sn+n(n∈N※) 设数列{an}的前n项和为sn,满足2sn=a(n+1)-2^(n+1)+1,n属于n*.且a1,a2+5,a3成等差数 已知数列an的前n项和为Sn=n^2+2n,求和:1/(a1*a2)+1/(a2*a3)+...+1/(an*a(n+1 已知数列an的前n项和为sn,且sn+an=1/2(n2+5n+2)(2属于n*) 计算a1 a2 a3 a4 设数列{an}的前n项和为Sn,并且满足2Sn=an²+n,an>0.(1)求a1,a2,a3.(2)猜想{a