题目内容

(本小题满分12分) 设a > 1,函数
(1)求的反函数
(2)若在[0,1]上的最大值与最小值互为相反数,求a的值;
(3)若的图象不经过第二象限,求a的取值范围.

解:(1) 由

··································································· 4分
(2) ∵ a > 1  ∴在[0,1]上递增

   即    
······························································································· 8分
(3) 在y轴上的截距为

要使的图象不过第二象限,
只需
     

因此,a的取值范围为····································································· 12分

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