数列{an}满足a1=1,a2=3,an+2-4an+1+4an=0
已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an
一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An
一直数列{an}满足a1=0,an=(an-1 +4)/(2an-1) ,求 an
数列an满足a1=2,an+1=4an+9,则an=?
数列{an}满足 a1=2,a2=5,an+2=3an+1-2an.(1)求证:数列{an+1-an}是等比数列; (2
数列{an}和{bn}满足a1=1 a2=2 an>0 bn=根号an*an+1
已知数列an满足a1=1.a2=3,an+2=3an+1-2an
已知数列{an}中,a1=-1,a2=4,an+2+2an=3an+1 求证:数列{an+1-an}是等比数列,并求{a
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
【急!】设{an}是由非负整数组成的数列,满足a1+0,a2=3,(an+1)( an )=(an-1)( an-2+2
数列{An}{Bn}满足下列条件:A1=0,A2=1,An+2=An+An+1/2,Bn=An+1-An
在数列{an}中,a1=-1,a2=0,an+1+4an-1=4an(n≥2),数列{bn}满足bn=an+1-2an.