题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062447-98463.png)
(Ⅰ)求不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-16389.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-29963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-41499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-75121.png)
答案
.解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-79881.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-40556.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-69638.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-79034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-91324.png)
(2)易得
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-85021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-29963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-41499.png)
则只需
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062450-18271.png)
综上所述
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062450-15920.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-79881.png)
第二问中,易得
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062449-85021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-29963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062448-41499.png)
核心考点
试题【选修4-5:不等式选讲 设函数.(Ⅰ)求不等式的解集;(Ⅱ)若,恒成立,求实数的取值范围.】;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/20190819/20190819062439-38600.png)
(1)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062439-93956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062439-94108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062440-91690.png)
(2)若当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062440-53380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062440-52248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062440-91690.png)
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062426-51920.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062426-67566.png)
(2)证明:对任意
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062426-86874.png)
(3)对于函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062426-48945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062427-67125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062426-48945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062427-48278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062427-67464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062427-19003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062427-92579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-21445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-92968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-21445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-82682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-99710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-50559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062429-78142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062428-21445.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062422-54678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062422-98377.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062422-54678.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062422-99456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062422-81396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062419-80672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062419-94159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062420-21908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062420-15787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062417-78632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062417-67063.png)
(2)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062417-78632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062417-21230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819062417-56027.png)
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