题目内容
对于在区间
上有意义的两个函数
,如果对于任意的
,都有
则称
在区间
上是“接近的”两个函数,否则称它们在区间
上是“非接近的”两个函数。现有两个函数
给定一个区间
。
(1)若
在区间
有意义,求实数
的取值范围;
(2)讨论
在区间
上是否是“接近的”。









(1)若



(2)讨论


(1)
(2)当
时,
与
是接近的




试题分析:(1)要使


要使


即

(2)


得

因为



所以


所以

于是


所以当



点评:第一小题函数定义域要满足使函数有意义,第二小题的求解首先要理解函数是接近的其实质是最值在



练习册系列答案
相关题目