题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065453-49252.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065453-63714.gif)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065453-37179.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065453-87102.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065454-48590.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065454-71860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065454-82768.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065454-66643.gif)
又2c=-3a-2b 由3a>2c>2b ∴3a>-3a-2b>2b
∵a>0
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065454-64051.gif)
(2)∵f(0)=c,f(2)=4a+2b+c=a-c………………………………6分
①当c>0时,∵
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-57786.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-64850.gif)
∴函数f(x)在区间(0,1
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-44064.gif)
②当c≤0时,∵a>0
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-62440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-75465.gif)
∴函数f(x)在区间(1,2)内至少有一个零点.
综合①②得f(x)在(0,2)内至少有一个零点……………………
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065455-75465.gif)
核心考点
试题【(10分) 设函数求证:(1); (2)函数在区间(0,2)内至少有一个零点; 】;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/20190819/20190819065444-99810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-46828.gif)
(1) 若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-65136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-51296.gif)
(2)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-51296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-67284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065445-53577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065444-51296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065442-14537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065442-40207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065442-30684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065442-47906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065443-85450.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065435-94736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065435-23251.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065436-71874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065436-93864.gif)
求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065436-27826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065426-12297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065426-34491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065427-88190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065427-95006.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065426-12297.gif)
(2)若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065427-34189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065427-70962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065427-22235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065428-24149.gif)
(3)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065428-57960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065424-95027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065424-50943.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065424-31234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065425-76445.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065425-12773.gif)
A
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065425-51815.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065425-35716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065425-60673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819065426-59829.gif)
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