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.

 

【答案】

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

【解析】略

 

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