已知数列{an}中,a1=3,满足an=2an-1+2∧n-1(n≥2)（1）求证数列﹛an-1/2的n次方﹜为等差数列；（2）求数列﹛an﹜的前n项和Sn

已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 已知数列{an}中满足(An+1-An)(An+1+An)=16,且a1=1,an 已知数列{an}满足3an+1+an=4,a1=9,求通项公式. 已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列 已知数列{an}满足a1=1/2,an+1=3an+1,求数列{an}通项公式 已知数列{an}满足a1=0,an+1=(an-根号3)/(根号3an+1) (n属于N+),则该数列中a20=____ 已知数列an满足a1=1 且 an=1/3an-1+(1/3)^n 则an数列中项最大值是? 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an 已知数列{an}中,a1=1/2,an+1+3an=0,an=( ) 已知数列{an}中a1=1,an+1=3an/an +3,求通项公式 (1)数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2),则a2005=____(2)已知数列｛an｝满足a1=1,a1×a2×a3…an=n^2,求an. 已知数列{an}满足an+1=an+n,a1等于1,则an=? 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 已知数列{an}满足a1+a2+...+an=n²an求其通项an 数列的通项公式的求法1.累加法已知数列{an}满足an+1=an+2n+1,a1=1,求an2.累乘法已知数列{an}满足a1=2/3,an+1=n/（n+1）an,求an3.构造新数列已知数列{an}中,a1=1,an=2an-1+1（n≥2）,求an注：an+1或an-1中的n-+1为 已知数列[an]满足An+1=1+an /3-an ,且a1=1/3,求证数列[1/(an -1）]是等差数列,并求an 已知数列an满足a1=1,a(n+1)=an/(3an+1) 求数列通项公式 已知数列{an}满足:a1=3,an=Sn-1+2n,求数列an及sn