已知数列{an}的前n项和为Sn,a1=,且2Sn=2Sn-1+2an-1+1(n≥2,n∈N*).数列{bn}满足b1=,且3bn-bn-1=n(n≥2,n∈N*). (Ⅰ)求证:数列{an}为等差数列; (Ⅱ)求证:数列{bn-an}为等比数列; (Ⅲ)求数列{bn}的通项公式以及前n项和Tn. |
与“已知数列{an}的前n项和为Sn,a1=14,且2Sn=2Sn-1+2an-1+1(n≥2,n∈N*).数列{bn}满足b1=34,且3bn-bn-1=n(n≥2,n∈N*).(Ⅰ)求证:数列{an}为等差数列;(Ⅱ)求证:数列{bn-an}为等比”考查相似的试题有: