题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035614-41052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035614-80642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-66010.png)
(I)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-25988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-11722.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-27802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-27932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-14056.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-32733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-24798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-14056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-49936.png)
解析
试题分析:(I)由已知条件,先求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-89766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-75052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-25988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-11722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-27802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-27932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-28374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-87027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-27802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-27932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-84050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-98617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-71966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-23228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-60695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-62124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-42361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-39992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-96842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-39992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-61183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-69341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-20606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-60695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-91306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-60695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-29690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-14056.png)
试题解析:(I)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035621-80106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-66010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035621-35248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035621-60742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-75052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-32733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-24798.png)
(Ⅱ)由(I)知
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035617-87027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035615-27802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-27932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035621-60749.png)
记
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-71966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-23228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-62124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-42361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-96842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035619-39992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-61183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-69341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-20606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035618-60695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035620-91306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035622-91259.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035622-76731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-14056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035616-49936.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-42171.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-49967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-79746.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-78369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-86418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035608-79746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035609-78788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035554-36592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035554-15565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035554-88243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035554-84758.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035554-36592.png)
(Ⅱ)求证:当x>0时,
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035555-34820.png)
(Ⅲ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035555-93074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035555-32422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035555-35610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035555-57291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035556-67690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035539-95981.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035539-41961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035539-12587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035540-50357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035539-12587.png)
(3)若对任意的
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035540-56771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035540-64803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035540-51259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035533-29366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035533-45643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035533-13214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035533-50715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035533-46590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035534-67410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035534-62389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035534-46610.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035524-78607.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035524-92322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035525-62174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035525-35674.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035525-79900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035525-37874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035526-13290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018035526-12794.png)
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