题目内容

已知数列{bn}的前n项和.数列{an}满足,数列{cn}满足
(1)求数列{an}和数列{bn}的通项公式;
(2)若对一切正整数n恒成立,求实数m的取值范围.
19.(1) 当时,······ 2分
适合上式
···································································· 3分
·························································· 5分
(2) ···································································· 6分

,即
∴ {cn}的最大项为··································································· 9分


∴实数m的取值范围为················································ 12分
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