题型:名词解释 设数列{an}的前n项和为Sn,且Sn=2an-3(n=1,2,…).(Ⅰ)证明:数列{an}是等比数列;(Ⅱ)若数列{bn}满足bn=an+2n(n=1,2,…),求数列{bn}的前n项和为Tn. 查看答案