题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-72307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-50406.png)
(1)设集合
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-44411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-98536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-23573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-76725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054357-47047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-12991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-26114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-23746.png)
(2)设点(a,b)是区域
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-74562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-62069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-23746.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-35983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-81154.png)
解析
试题分析:(1)分a=1,2,3,4,5 这五种情况来研究a>0,且
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-60275.png)
(2)由条件可得,实验的所有结果构成的区域Q 的面积S△OMN=
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-17372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-59126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-44146.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-46342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-29454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-37922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-64113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-23746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-68322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-60275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-74541.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-71724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-10208.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-40656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-16762.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-13165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-16762.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-11876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-48116.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-75472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-52283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054401-82527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-74008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-74008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-65857.png)
(2)由(1)知当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-59253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054400-68322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-29454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054358-23746.png)
依条件可知试验的全部结果所构成的区域为
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-21056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-68848.jpg)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-75368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-34802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054402-74008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054359-44146.png)
核心考点
试题【已知关于的二次函数(1)设集合和分别从集合和中随机取一个数作为和,求函数在区间上是增函数的概率.(2)设点(a,b)是区域内的随机点,求函数在区间上是增函数的概】;主要考察你对简单的线性规划等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054351-86884.jpg)
今需要A,B,C三种规格的成品分别是15,18,27块,至少需要这两种钢板共是 张.
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054345-45080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054345-20654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054345-29388.png)
A.![]() | B.![]() | C.5 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054339-27975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054339-37838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054339-27923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054330-59227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054330-53889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054330-20611.png)
A.6 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054315-85336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054315-22577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054315-18486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054315-60548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054316-89769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017054316-74627.jpg)
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