已知数列{an}的前n项和为sn,且sn=2an-2(n=1,2,3.);数列{bn}中,b1=1,点p(bn,bn+1)在直线x-Y+2=0上.
问题描述:
已知数列{an}的前n项和为sn,且sn=2an-2(n=1,2,3.);数列{bn}中,b1=1,点p(bn,bn+1)在直线x-Y+2=0上.
(1)求a1和b2
(2)求证数列{an}为等比数列
(3)记Tn=a1b1+a2b2+.+anbn,求满足sn
答
已知数列{a‹n›}的前n项和为s‹n›,且sn=2a‹n›-2(n=1,2,3.);数列{b‹n›}中,b₁=1,点p(b‹n›,b‹n+1›)在直线x-Y+2=0上.(1)求a₁和b...