(本小题8分) 设函数(常数 (1)求的定义域; (2)在函数的图像上

(本小题8分) 设函数(常数

(1)求的定义域;

(2)在函数的图像上是否存在不同的两点,使得过这两点的直线平行于x轴?

(3)当满足什么条件时,上恒取正值。

答案

(本小题8分)

解:(1)定义域为

(2)通过定义可证函数在定义域上是单调递增的,所以不存在不同的两点,使得过这两点的直线平行于x轴。

(3)由于函数在定义域上单调递增,所以只需即可,解得

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