题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083457-39569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-90094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-27141.png)
否命题是: .
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-81275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083459-85972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083459-10449.png)
解析
试题分析:原命题:“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-90094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-27141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083458-81275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083459-85972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083459-10449.png)
点评:熟练掌握四种命题的写法,注意否命题与命题的否定的区别。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083452-19125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083452-42756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083428-27654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083428-65794.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-18411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-54186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083434-42872.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-30142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-95158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-89279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-95687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-62036.png)
①存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-44564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-86115.png)
②函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-36142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-88501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-57791.png)
③函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-20362.png)
④已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-31544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-96820.png)
其中正确的命题的个数为
(1)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083408-76569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083408-36057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-84658.png)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-86982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-43540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-14481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-86938.png)
(3)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-14481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-72769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-41784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-42237.png)
(4)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-64368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083411-95093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083411-74481.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083347-79751.png)
②函数y=sin(2x+
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083347-31237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-75756.png)
③将函数y=cos(2x-
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-86522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-86522.png)
④函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-60709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-16520.png)
其中正确的命题的序号是 .
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