题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-80947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-45645.png)
![]() | … | 0.5 | 1 | 1.5 | 1.7 | 1.9 | 2 | 2.1 | 2.2 | 2.3 | 3 | 4 | 5 | 7 | … |
![]() | … | 8.5 | 5 | 4.17 | 4.05 | 4.005 | 4 | 4.005 | 4.102 | 4.24 | 4.3 | 5 | 5.8 | 7.57 | … |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-93549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-45645.png)
(1) 当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-70330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-20079.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-18129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-93549.png)
(2) 由此可推断,当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-61343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-18129.png)
(3) 证明: 函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-20079.png)
(4) 若方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-19937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-47980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-79518.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-88988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-60905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-11664.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-88988.png)
(2)最大值 -4;
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-60905.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-88988.png)
(2)最大值 -4;
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-60905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013100-45864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013100-84607.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013100-44200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013100-35864.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013100-96728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013101-70519.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013102-84582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013102-72860.png)
∴函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013057-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013102-62631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013058-20079.png)
(4)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013059-11664.png)
核心考点
试题【(本题满分12分)探究函数,的最小值,并确定取得最小值时的值,列表如下:…0.511.51.71.922.12.22.33457……8.554.174.054.】;主要考察你对分段函数等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013050-23226.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013050-16733.gif)
A. 8 | B. 7 | C. 6 | D. 5 |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013049-13416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013049-13416.gif)
x | 1 | 2 | 3 |
f(x) | 6.1 | 2.9 | -3.5 |
A. (-∞,1) | B. (1,2) | C. (2,3) | D. (3,+∞) |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013047-62188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013047-84001.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013046-67147.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013046-57371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013043-57016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013044-73447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013044-60414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818013044-74138.gif)
A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
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