题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124740-10204.png)
A.0 个 | B.1个 | C.2个 | D. 3个 |
答案
解析
解答:当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124740-53192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-46758.png)
其逆命题是:若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-46758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124740-53192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-76502.png)
否命题是:若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-42480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-45734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124741-76502.png)
逆否命题与原命题等价,故为真命题。选B。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-20724.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-88945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-13193.gif)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-13193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-13193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124727-10355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-31254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124728-72223.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124726-65480.gif)
其中真命题是 (填写真命题的编号)
①定义在R上的函数f(x)在区间(-∞,0]上是增函数,在区间(0,+∞)也是增函数,则函数f(x)在R上是增函数;
②若f(2)=f(-2),则函数f(x)不是奇函数;
③函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124715-72871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124716-77870.gif)
④对应法则和值域相同的函数的定义域也相同;
⑤函数的定义域一定不是空集; 写出上述所有正确结论的序号: ▲ .
A.若![]() ![]() ![]() |
B.设数列![]() ![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124655-84680.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124655-52424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124656-56468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124656-57915.gif)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124655-84680.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124656-18454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124656-52078.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124657-33500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124657-58765.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124657-90438.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124656-18454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124657-58765.gif)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124655-84680.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124657-24190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124658-75621.gif)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124658-71085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124658-29144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124658-71085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124655-84680.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124645-17648.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124645-76298.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102124646-89288.gif)
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