数列an满足a1=1/2 a(n+1)=1/2-an （1）求数列an的通向公式 （2）设数列an的前n项为Sn 证明Sn

数列{an}满足a1=2,a(n+1)=2an+n+2,求an 数列an满足a1=1,a(n+1)=an/[(2an)+1],求a2010 数列[An]满足a1=2,a（n+1）=3an-2 求an 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 数列{an}满足a1=2,a(n+1)=-1/(an+1),则a2010等于 数列｛an｝满足a1=3,a n+1=2an,则a4等于 已知数列{an}满足a(n+1)=an+n,a1=1,则an= 数列{an}满足a1=1 an+1=2n+1an/an+2n 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=2,an=a(n-1)+2n,（n≥2）,求an 已知数列{an}满足a1=33,a(n+1)-an=2n,则an/n的最小值 已知数列{an}满足a1=33,a（n+1）-an=2n,求an/n的最小值 已知数列an满足a1=100,a(n+1)-an=2n,则(an)/n的最小值为 已知数列{an}满足a1=2,a(n+1)-an=a(n+1）*an,则a31=? 数列{An}满足A1=1,A(n+3)=An+3,A（n+2)=An +2 已知数列{a}满足a1=1/2,a（n+1）=an+1/(n^2+n),求an已知数列{a}满足a1=1/2,a（n+1）=an+1/(n^2+n),求an 已知数列｛an｝满足a(n+1)=an+3n+2,且a1=2,求an=? 在数列an中,a1=1,且满足a（n+1）=3an +2n,求an