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(本小题满分12分)已知数列的首项 （1）求的通项公式； （2）证明：对任意的．...

(本小题满分12分)已知数列6ec8aac122bd4f6e的首项6ec8aac122bd4f6e

（1）求6ec8aac122bd4f6e的通项公式；

（2）证明：对任意的6ec8aac122bd4f6e．

 

【解析】 (1)       ∴     ∴ 又 ∵       ∴ 是以为首项，为公比的等比数列················································· 4分 ∴     ∴ ·························································································· 6分 (2) 由 (1) 知·········································································· 7分 ∴ 原不等式成立····················································································· 12分 【解析】略
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