An=1/(n+1)+1/(n+2)+.+1/2n,则An+1-An等于?
An=1/(n+1)+1/(n+2)+.+1/2n,则An+1-An等于?
已知数列{an}中,a1=1,满足an+1=an+2n,n属于N*,则an等于
在数列{an}中,a1=1,a2=5,an+2=an+1-an (n∈N*),则a100等于( an+2=an+1-an
已知数列{an}中,a1=2,an+1=an+2n(n∈N+)则a10等于
an-an-1=2(n-1)
已知数列{an},an=2^n,则1/a1+1/a2+...+1/an等于多少?
数列{an}满足a1=1 an+1=2n+1an/an+2n
数列{an},a1=1,an+1=2an-n^2+3n,求{an}.
已知数列{an}满足an+1=2an+n+1(n∈N*).
数列{an}满足a1=1 an=2a(n-1)+1(n≥2)则an等于
若数列an由a1=2,an+1=an+2n(n大于等于1)确定,则a100
已知数列{an}的首项a1=1,且{an}满足an=n(n+an-1),其中n大于等于2,求{an}的通项