题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185812-69571.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185812-78923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185812-13483.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-74544.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-57133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-96909.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-45588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-25176.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185814-32094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185814-65460.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185814-19806.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185814-45261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185814-32639.gif)
所以函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185812-78923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-45588.gif)
(2)不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-57133.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185815-12649.gif)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185815-51537.gif)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185815-77551.gif)
所以:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185815-77457.gif)
解得:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185813-25176.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185756-77829.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185756-48447.gif)
(Ⅰ)试求b、c满足的关系式;
(Ⅱ)若c=2时,各项不为零的数列{an}满足4Sn·f(
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185757-20485.gif)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185757-11225.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185757-92149.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185757-99660.gif)
(Ⅲ)设bn=-
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185757-20485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185729-77148.gif)
(1)解不等式f(x)<0;
(2)试推断函数f(x)是否存在最小值?若存在,求出其最小值;若不存在,说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185712-27021.gif)
|
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185630-61608.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185631-63471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185631-41283.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185631-45285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185631-75309.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-90991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-71595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-77158.gif)
(2)若a,b均为负整数,且
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-77158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-56588.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-90991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-71595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185632-41570.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-15737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-47595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-80469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-47595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-29049.gif)
(1)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-47595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-75076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-95724.gif)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-47595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-75076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-34876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185617-75076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-58905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-61944.gif)
(3)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185616-47595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-22123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-34876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185618-22123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185619-90974.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205185619-29012.gif)
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