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(本小题满分12分) 已知函数,数列,满足条件:. (1)求证:数列为等比数列;...

(本小题满分12分) 已知函数6ec8aac122bd4f6e,数列6ec8aac122bd4f6e6ec8aac122bd4f6e满足条件:6ec8aac122bd4f6e

(1)求证:数列6ec8aac122bd4f6e为等比数列;

(2)令6ec8aac122bd4f6e,Tn是数列6ec8aac122bd4f6e的前n项和,求使6ec8aac122bd4f6e成立的最小的n值.

 

【解析】 (1) 证明:由题意得, ∴ ········································································ 3分 又 ∵     ∴ ················································································ 4分 故数列{bn + 1}是以1为首项,2为公比的等比数列·············································· 5分 (2) 由 (1) 可知,,∴ ·········································· 7分 故················································ 9分 ∴ ············································ 10分 由,得 ∴ 满足条件的n的最小值为10···································································· 12分 【解析】略
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