题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194247-37337.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194247-42651.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194247-71148.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194247-39638.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194247-94201.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-11414.jpg)
A.k<l | B.![]() | C.k >-1 | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-94575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194249-98046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194249-37595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194249-74479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194249-73493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194249-17326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-26260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-83965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-15305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-88465.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-38930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-90987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-91922.png)
综上可得,
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-44520.png)
方法二:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-94575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-98473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-78452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-26260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-78414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-92424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194248-47016.png)
函数图象如下:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-85348.jpg)
当直线
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-92424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-78414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-92424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-94940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-91922.png)
当直线
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-92424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-92424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194252-78414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194253-76333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194253-47442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194253-32278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194253-18984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194250-88465.png)
综上可得,
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194251-44520.png)
核心考点
试题【设的定义域为D,若满足下面两个条件,则称为闭函数.①在D内是单调函数;②存在,使f(x)在[a,b]上的值域为[a,b].如果为闭函数,那么k的取值范围是A.k】;主要考察你对指数函数图象及性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194242-13675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194242-54222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194242-49648.png)
A.(2, 3 ) | B.(3, 4 ) | C.(0, 1 ) | D.(1, 2 ) |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-61023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-28197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-74537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-67530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-97946.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-29210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-66659.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-71174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-23782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-88537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-45635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-18676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-40655.png)
(ⅰ)求当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-12533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194238-71174.png)
(ⅱ)求方程
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-91030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194239-28517.png)
(本题满分14分)已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-28915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-15658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-47094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-64162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-63897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-64162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-40170.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-64162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-63897.png)
(2)若方程
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194231-12986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-95833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-94122.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-57748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-99223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-24287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194232-94122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194230-98884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194230-10077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194230-96794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194228-43579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194228-10164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819194228-31020.png)
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