题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064635-30711.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064635-32667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064635-77077.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064635-59936.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064635-77077.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-84874.gif)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-36969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-53880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-84874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-78744.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-24990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-19326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
(2) 当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-35245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-84874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-73863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064638-41441.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
又-4≤
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064638-28785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-53880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-84874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064638-10648.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-73863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-73863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064637-73863.gif)
故-7≤
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
综上,得-7≤
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064636-60091.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-16024.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-18515.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-57026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064633-31971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064633-98002.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064632-13508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064629-37427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064628-24563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064628-83402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064628-79558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064624-99321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064621-49759.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064621-34795.gif)
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