题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021459-72183.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021459-39896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021459-84904.png)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021459-81200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-66780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-82626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-24844.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-37538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-34207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-80518.png)
解析
(1)利用当a=1,确定解析式然后求解导数,分析单调区间,得到其极值。
(2)因为要使直线对于任意的ms实数,x+y+m=0都不是曲线的切线,说米呢了导数值大于其斜率值
解:(Ⅰ)因为当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-94998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-94218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-55075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-60234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021502-94569.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021502-42111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021502-24105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021502-90641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021503-76247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-37538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021503-79877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021503-17774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-37538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021500-34207.png)
(Ⅱ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021503-45756.png)
所以,要使直线
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021504-20339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021504-64644.png)
不是曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021504-79520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021504-88345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021501-80518.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-96843.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-13773.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-51044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-31291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-11438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021450-64957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021451-62318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021435-50925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021435-61266.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021435-94141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021436-62765.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021436-62765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021436-43322.png)
(3)对于
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021436-27917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021436-59063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021431-66167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021431-84210.png)
A.[-2,0 ] | B.[-4,1] | C.[-4,0 ] | D.[-2, 9] |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021426-94409.png)
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021418-80774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021418-73115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021418-50350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021419-76292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021418-80774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021419-12893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021419-46730.png)
A.[![]() | B.![]() | C.![]() | D.![]() |
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