题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-33989.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-32772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-43819.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-91038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-32251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-22489.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-18635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-75061.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-76056.png)
解析
试题分析:(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-74805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-76089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-28792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-97466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-63019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-68651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-46754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-43819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-73157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-54774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-73157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-95205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-69325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-99484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-95205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-16695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-37723.png)
试题解析:(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-74805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-76089.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-28792.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-97466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031854-63019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031857-92866.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031857-17338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-46754.png)
(ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031857-13919.png)
(ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031857-70985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031857-42015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031858-52992.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031852-43819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031855-73157.png)
(2)证明:当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031858-56072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031858-12775.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031858-76982.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031858-78844.png)
讨论
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031859-46594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031859-68020.jpg)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-69325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031856-99484.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031859-11096.png)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-32251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-22489.png)
(3)证明:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031859-59084.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031900-76655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031900-76158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031900-35140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031900-51461.png)
由(2)有
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031900-52247.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031853-75061.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031831-80433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031831-51534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031831-59811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031831-68428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-17780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-78659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031831-68428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-37215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-17780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-37215.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-10651.png)
(2)已知实数t∈R,求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031832-22332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031833-76584.png)
(3)令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031833-41158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031833-35603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031833-51069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031834-87914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031834-51552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031834-34820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031834-13039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031834-87914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031817-19199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031817-75616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031817-17047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-62308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031817-75616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031817-75616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-62308.png)
(1) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-25800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-31379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-92320.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-15485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-57208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031819-95408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031819-78325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-62308.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-62308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031818-31379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031819-69290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031819-12906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031812-89766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031812-95279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031802-89153.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031802-17797.png)
(2)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031802-84736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031802-34033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031803-72877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018031803-16967.png)
A.(-∞,0) | B.(0,+∞) | C.(-∞,1) | D.(1,+∞) |
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