题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
解不等式x
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-62841.gif)
依题意,p
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-67073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021104-12207.gif)
于是有
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021105-36691.gif)
∴正实数a的取值范围是0<a≤3。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021059-92213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021059-35914.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021055-61050.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021048-93873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021048-34285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021048-11188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021048-35967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021049-76247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021042-24362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021043-19061.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021043-43589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021043-86789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021038-14588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021038-39845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021038-69627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103021038-14588.gif)
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