数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.
一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An
数列an满足a1=2,an+1=4an+9,则an=?
已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
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
一直数列{an}满足a1=0,an=(an-1 +4)/(2an-1) ,求 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
已知数列{an}满足a1=1,a2=-13,an+2-2an+1+an=2n-6
已知数列{an}满足a1=1,a2=-13,an+2-2an+1+an=2n-6
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=2,an+2=an+an+12,n∈N*.
已知数列an满足a1=1.a2=3,an+2=3an+1-2an