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已知数列{bn}的前n项和.数列{an}满足,数列{cn}满足. (1)求数列{...

已知数列{bn}的前n项和6ec8aac122bd4f6e.数列{an}满足6ec8aac122bd4f6e,数列{cn}满足6ec8aac122bd4f6e

(1)求数列{an}和数列{bn}的通项公式;

(2)若6ec8aac122bd4f6e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 又适合上式 ∴ ···································································· 3分 由·························································· 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 【解析】略
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