题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060130-11893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060130-82842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060130-18072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060130-46803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-66234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-58269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-47363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-66234.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060132-56462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060132-37835.png)
解析
试题分析:(1)此小题即为恒成立问题,只需当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060132-25770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060133-47602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060133-68154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-58269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-47363.png)
试题解析:因为命题
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060130-82842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060133-46160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060132-25770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060133-87269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060134-60504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060134-87341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060132-56462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060134-98810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060134-33073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060134-31940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-58269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060131-47363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060135-10085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060135-15141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060135-25145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060135-44536.png)
核心考点
举一反三
A.命题“若x2 =4,则x=2”的否命题为:“若x2 =4,则x≠2” |
B.“x=2”是“x2—6x+8=0”的必要不充分条件 |
C.命题“若x=y,则cosx=cosy”的逆否命题为真命题 |
D.命题“存在x∈R,使得x2+x+3>0”的否定是:“对于任意的x∈R,均有x2 +x+3<0" |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060045-10422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060045-72607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060006-99319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060006-43056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102060006-34952.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055915-16970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055915-43526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055915-84564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055916-34619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055916-80608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055916-56650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055916-37251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055910-96585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055910-44109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102055910-88839.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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