已知數(shù)列{bn}的前n項(xiàng)和.?dāng)?shù)列{an}滿足,數(shù)列{cn}滿足
(1)求數(shù)列{an}和數(shù)列{bn}的通項(xiàng)公式;
(2)若對(duì)一切正整數(shù)n恒成立,求實(shí)數(shù)m的取值范圍.
19.(1) 當(dāng)時(shí),······ 2分
適合上式
···································································· 3分
·························································· 5分
(2) ···································································· 6分

,即
∴ {cn}的最大項(xiàng)為··································································· 9分


∴實(shí)數(shù)m的取值范圍為················································ 12分
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