题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064041-97475.png)
被称为狄利克雷函数,其中
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-11445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-29979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-76357.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-51815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-79753.png)
③任取一个不为零的有理数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-87020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-28567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-57197.png)
④存在三个点
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-59748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-93751.png)
其中真命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
答案
解析
试题分析:由题意知,
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-40005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-10696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-18628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064044-44751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064044-76208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064044-48245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064045-15217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064045-49580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-76357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064042-87020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064045-53409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064045-40450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064046-32718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064046-19904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064043-93751.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064022-68102.png)
②“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064022-24885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064023-11870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064023-24379.png)
③“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064023-25290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064024-34688.png)
④“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064024-10485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064024-25407.png)
A.①② | B.②③ | C.①③ | D.③④ |
A.![]() |
B.![]() |
C.![]() |
D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063959-80699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063959-25540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063959-72265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063959-50000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063959-50000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064000-79539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064000-29136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064000-41231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064001-21366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064001-38707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064001-38980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064002-19178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063940-94619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063940-10360.png)
q:曲线y=x2+(2a 3)x+1与x轴交于不同的两点.若“p且q”为假,“﹁q”为假,求a的取值范围.
①命题
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063922-77667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063922-54552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063922-90300.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063922-30722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063923-31255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063923-89923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063923-78338.png)
③“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063924-56923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102063924-85102.png)
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