a1=1 an+1=3an+4 求an

已知{an}中a1=1 且an+1=3an+4求an 已知等差数列{an}中,a1=2.an+1=an+3分之an 求an a1=1 an+1=an/2an+3,用两种方法求an 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. a1=3,an=2an-1+3 证{an+3}等比,并求an 数列an,a1=4,an+1=5^n*an,求an 在等差数列an中,a1=2,3an+1-an=0,求an a(n+1)=2an/3an+4,a1=1/4,求an 已知数列{an}中,a1=-1,a2=4,an+2+2an=3an+1 求证：数列{an+1-an}是等比数列,并求{a 数列an中,a1=4,an+1=(3an+2)/(an+4),bn=an-1/an+2,求bn通项公式 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an