【题文】已知函数则的值为( )A.B.4C.2D.
【题文】已知函数则的值为( )A.B.4C.2D.
题型:难度:来源:
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095750-50665.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095750-58817.png)
的值为( )
A.![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095751-24285.png) | B.4 | C.2 | D.![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095751-53314.png) |
答案
【答案】A
解析
【解析】
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095751-13437.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095751-38533.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095750-58817.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095752-46881.png)
.
考点:分段函数函数值的计算.
举一反三
【题文】计算:
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095745-90014.png)
=____________.
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095725-83122.png)
在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095725-88115.png)
上为减函数,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095726-47416.png)
的取值范围是____________.
【题文】(本小题满分12分)计算:
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095719-54562.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095719-43148.png)
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095625-11938.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095626-71412.png)
,若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095626-25271.png)
,那么
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095627-80120.png)
与
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095627-52120.png)
在同一坐标系内的图像可能是
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095628-85238.jpg)
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