若数列{an}满足a1=1,a2=5且an+2=an+1-an,求a2000
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
数列{an}满足a1=1,且an=an-1+3n-2,求an
已知数列{an}满足:a1=1,且an-an-1=2n,求(1)a2,a3,a4.(2)求数列{an}的通项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:a1=1,且an-a(n-1)=2n.求a2,a3,a4.求数列{an}通项an
一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An
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(n+1)an-nan+1=2,且a1=3.求an的通项公式,(2),求和:(a1+a2)+(a2+
已知数列{an}满足an+1=2an+3.5^n,a1=6.求an
数列an满足a1=2,an+1=an²求an
已知数列an满足an=1+2+...n,且(1/a1)+(1/a2)+...(1/an)
关于数列极限的已知数列an满足a1=0 a2=1 an=(an-1+an-2)/2 求lim(n->无穷)an