题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064517-84852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064517-41483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064518-56408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064518-56055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064518-50868.png)
① 使
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064518-71586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064517-41483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064519-97239.png)
② 函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064519-52566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064519-52159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064520-53835.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064520-81741.png)
④ 设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064520-36687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064520-95909.png)
A.1个 | B.2个 | C.3个 | D.4个 |
答案
解析
试题分析:①由题意知[x+1]=3时,有x+1≥3 X+1<4,解得即可;
②由题意[x]≤x<[x]+1,得x-[x]的取值范围,即{x}的值域;
③观察
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064521-78556.png)
④由题意0≤f(x)<1,讨论0≤x<1,x≥1和x<0时,
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064520-95909.png)
核心考点
试题【已知表示不超过实数的最大整数,如:.定义,给出如下命题:① 使成立的的取值范围是;② 函数的定义域为,值域为;③1007;④ 设函数,则函数的不同零点有3个.其】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064503-51446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064504-48811.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064447-52705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064447-39831.png)
A.存在![]() ![]() | B.不存在![]() ![]() |
C.存在![]() ![]() | D.对任意![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064431-79658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064413-22775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064414-67995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064414-39439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064414-24181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064413-22775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064414-66521.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064404-31602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064404-88938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102064404-86315.png)
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