已知数列{An}满足2an+1=an+an+2,它的前n项和为Sn,且a3=5已知数列{An}满足2a(n+1)=an+a(n+2),它的前n项和为Sn,且a3=5,s6=36,(1)求an;(2)已知等比数列bn满足b1+b2=1+a,b4+b5=a^3+a^4(a不等于-1),设数列{an*bn}的前n项和为T

已知数列an满足1/a-an=2根号n,且an>0.求an的通项公式是数列{an}满足1/an-an=2根号n，且an>0，求an的通项公式。 已知数列an满足条件a1=-2 a（n+1）=2an/(1-an) 则an= 已知数列an满足a1=1,a(n+1)=an/(3an+2),则an=? 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 周期性数列问题i已知数列｛an}满足a(n+1)=2an (0 已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列 已知数列｛An｝满足a1=1,a（n+1）=2an+1 求证数列{an+1}是等比数列 求数列｛an｝通式 数列题,求通项已知数列｛An}满足A=2An/(1-An),A1=2,求数列｛An}的通项公式 已知数列{an}满足,a1=2,a(n+1)=3根号an,求通项an数列{an}满足:an>0,且根号下Sn=an+1/4,求通项an 已知数列an满足a1=1,1/an+1=根号1/an^2+2,an>0,求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,an+1 -an+2an+1•an=0求通项 已知数列{an}满足a1=2,an+1=2an/an+2,则an等于多少 已知数列{an}满足a1=2,an+1-an=an+1*an,那么a31等于 已知数列{an}满足2an/an+2=an+1(n属于正整数),a1=1/1006.求证:数列{1/an}是等差数列,并求通项an已知数列{an}满足（2an）/（an+2）=a（n+1）(n属于正整数),a1=1/1006.求证:数列{1/an}是等差数列,并求通项an， 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+lg2,a1=1,求an