题目内容

(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;
(2)令,Tn是数列的前n项和,求使成立的最小的n值.
解:(1) 证明:由题意得
········································································ 3分
又∵   
················································································ 4分
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
················································ 9分

············································ 10分
,得
∴满足条件的n的最小值为10···································································· 12分
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