高二数列题：设数列{an}满足an+1=an^2-nan+1,n为正整数,当a1>=3时,证明……设数列{an}满足an+1=an^2-nan+1,n为正整数,当a1>=3时,证明(2)1/(1+a1)+1/(1+a2)+……+1/(1+an)=<1/2

　　高二数列题：设数列{an}满足an+1=an^2-nan+1,n为正整数,当a1>=3时,证明……

　　设数列{an}满足an+1=an^2-nan+1,n为正整数,当a1>=3时,证明

　　(2)1/(1+a1)+1/(1+a2)+……+1/(1+an)=