题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-59702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-69435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-58732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-10706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-19689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-19923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-71676.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-71676.png)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-83619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-34601.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-29298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-34601.png)
解析
(1)因为点
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-19689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-59592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-68060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-51343.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-83619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-42338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-83193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-32196.png)
(Ⅰ)点
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160201-19689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-59592.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-68060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-51343.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-92351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-54151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160203-29298.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-83619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-42338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-83193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-32196.png)
····································· 8分
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160204-39619.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160205-15328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
而函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160205-15145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160205-71232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160206-48902.png)
故当
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-53289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160202-34601.png)
核心考点
试题【(本小题满分12分) 已知函数(且)的图象过点,点关于直线的对称点在的图象上.(Ⅰ)求函数的解析式;(Ⅱ)令,求的最小值及取得最小值时x的值.】;主要考察你对对数函数的定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160157-42211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160157-90456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160157-73313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160157-85688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160158-67708.png)
A.![]() | B.3 | C.5 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160154-50458.png)
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160151-22766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160151-90125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160151-10289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160151-61242.png)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160146-14124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160146-93906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160146-56641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160146-56641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820160143-49342.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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