已知数列{an}的前n项和为Sn,且对任意n∈N*有an+Sn=n. (1)设b
题型:解答题
问题:
已知数列{an}的前n项和为Sn,且对任意n∈N*有an+Sn=n.
(1)设bn=an-1,求证:数列{bn}是等比数列;
(2)设c1=a1且cn=an-an-1 (n≥2),求{cn}的通项公式.
已知数列{an}的前n项和为Sn,且对任意n∈N*有an+Sn=n.
(1)设bn=an-1,求证:数列{bn}是等比数列;
(2)设c1=a1且cn=an-an-1 (n≥2),求{cn}的通项公式.