题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-46489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-78251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
(2)若集合
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-64761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-83130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-16234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-20212.png)
②若a
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063519-46448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063519-87031.png)
综合①②得:a≥0。所以存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-78251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-20212.png)
(2)B={x|ax2+2(a-1)x-4≥0}
①若a=0则B={x|-2x-4≥0}={x|x≤-2}
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063519-46448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-20212.png)
②若a
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063519-46448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-83130.png)
所以不存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063517-88008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063518-83130.png)
解析
核心考点
试题【(1)已知集合,是否存在实数使?若存在,求出的取值范围;若不存在,请说明理由;(2)若集合,是否存在实数使?若存在,求出的取值范围;若不存在,请说明理由.】;主要考察你对一次函数的图象和性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063511-88369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063512-14767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063512-66894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063512-62655.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063508-51197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063508-96962.png)
①只有唯一的
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063508-76048.png)
②有两个
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063508-76048.png)
③有三个
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063508-76048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063509-29382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063505-19024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063505-49973.png)
t | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 |
y | 12 | 15.1 | 12.1 | 9.1 | 11.9 | 14.9 | 11.9 | 8.9 | 12.1 |
经长期观察,函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063506-87484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063506-22338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063506-91941.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063506-62464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063506-31862.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063507-20181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063507-90538.png)
设M是由满足下列条件的函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063455-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-15371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-83945.png)
(I)判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-34953.png)
(II)集合M中的元素
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063455-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063455-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-43434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-15371.png)
(III)对于M中的函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063456-63499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063455-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063457-21873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063457-82581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063457-77668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063452-64136.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063452-41162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063452-65986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063452-75690.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063453-88463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063453-74336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063452-65986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063453-48668.png)
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