已知数列｛an｝满足a1=3,a(n+1)=an^2-nan+λ（n∈N*,λ为实数）(1）若an≥2n恒成立,求λ的取值范围（2）若λ=-2,求证1/(a1-2)+1/(a2-2)+……+1/(an-2)＜2

已知数列{an}满足a1=1,3a(n+1)+an-7 已知数列an满足a1=1,a(n+1)=an/(3an+1) 求数列通项公式 已知数列{an}满足a(n+1)=an+n,a1=1,则an= 已知数列｛an｝满足a(n+1)=an+3n+2,且a1=2,求an=? 已知数列an满足a(n+1)=an+3n+2,且a1=2,求an 已知数列{an}满足条件a1=3,且a( n+1)-an=(20)^n+n,求通项公式已知数列{an}满足条件a1=3,且a( n+1)-an=(2)^n+n,求通项公式 已知数列an满足a1=1,a(n+1)=an/(3an+2),则an=? 已知数列{an}满足a(n+1)=an+lg2,a1=1,求an 已知数列{an}满足a1=1,a2=3,a(n+2)=a(n+1)-an,求S2012 已知数列{an}满足3a(n+1)=2an-4,且a1=1/5,求an 已知数列an满足a1=3,a n+1-3an=3的n次方, 已知数列{an}满足：a1=1,an=a1+2a2+3a3+``````+(n-1)a(n-1)(n大于等于2）,则通项公式an是什么? (1)数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2),则a2005=____(2)已知数列｛an｝满足a1=1,a1×a2×a3…an=n^2,求an. 已知数列{an}满足a1=1,an=3^n+2a(n-1),(n>=2),求数列的通项an. 已知数列an满足an=4a(n-1)+3n-4,且a1=3,证明数列an+n为等比数列 1）已知数列{An}满足：An+2/A(n-1)=3 （n大于等于2） A1=32)已知数列{An}满足：A1=1/2,AnA(n+1)=An-A(n+1)3)已知数列{An}满足:A1=1,A(n+1)=2An+3第一小题没看懂诶 下标的 和别的加一减一搞不清楚了 已知数列an满足:a1=1,an-a(n-1)=n n大于等于2 求an 已知数列{an}满足a1=33,a(n+1)-an=2n,则an/n的最小值