题目:
已知数列{an}的前n项和为Sn,且an是Sn与2的等差中项,数列{bn}中,b1=1,点P(bn,bn+1)在直线x-y+2=0上.
(1)求数列{an},{bn}的通项an和bn;
(2)设cn=an+bn,求数列{cn}的前n项和Tn。
答案:
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