设数列an满足a1=4,an=(1/3)(an-1 +2),求lim(a2+a4+...+a2n -3n)我算出来an=3*（1/3)^n+3

设数列AN满足A1等于1,3(A1+a2+~+AN)=(n+2)an,求通向公式 设数列{an}满足a1=1, an=(4an-1 +2)/(2an-1 +7) ,则通项xn=? 已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 设数列{an}满足lg(1+a1+a2+...+an)=n+1,求通项公式an 数列{an}满足Sn+Sn+1=5/3an+1,a1=4求an 已知数列{an}满足3an+1+an=4,a1=9,求通项公式. 设数列｛An｝满足 A1=6,A2=4 A3=3,且数列{An+1-An}（n属于自然数）是等差数列,球An的通向公式 rt设数列｛An｝满足 A1=6,A2=4 A3=3,且数列{An+1-An}（n属于自然数）是等比数列,球An的通向公式rt 数列an满足a1=2,an+1=4an+9,则an=? 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 数列[An]满足An+1-An+3=0,且A1=-5.求An. 数列{an}满足a1=3/2,an+1=an2-an+1,求证：1/an=1/(an)-1 - 1/(an+1)-1数列{an}满足a1=3/2,an+1=an2-an+1,求证：1/an=1/(an)-1 - 1/(an+1)-1设Sn=1/a1+1/a2+...+1/an,n>2证明1 设数列an满足a1=2,a(n+1)=3an+2^(n-1),求an2,设数列an满足a1=2,a(n+1)=3an+2n,求an 设数列【an】满足a1=1,3（a1+a2+a3+······+an）=（n+2）an,求通项an 数列 (10 18:35:56)设数列{an}满足a1=9,an+1=-1/2an+3,求an的通项公式（含过程） 设数列{an}满足：a1+a2/2+a3/3+a4/4……+an/n=An+B,其中A、B为常数.数列{an}是否为等差数列? 已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.求数列an的通向公式.设数列bn是的前n项和已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.(1)求数列an的通向公式.(2)设数列bn是的前n项和为sn, 数列AN满足A1=2,AN+1=AN^2+6AN+6,设CN=LOG5(AN+3),证｛CN}为等比 设数列,a1=3,an+1=3an-2,求数列an是等比数列