题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200630-47348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200630-16204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-68413.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-85713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-44014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-85713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-44014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-96737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-55495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-34497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200633-53997.png)
解析
试题分析:解:(1) ∵
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200630-16204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200633-50083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200633-97087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200633-76942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-38662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-44014.png)
即基本事件总数为16
设“方程
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-71324.png)
方程
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-41404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200630-16204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-71324.png)
∴方程
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-34497.png)
(2) ∵
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-96894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-96737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200631-98770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-55495.png)
则试验的全部结果构成区域
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200634-39975.png)
这是一个矩形区域,其面积
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200635-58320.png)
设“方程
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200635-10180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200635-56190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200635-23368.png)
方程
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200632-57324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200633-53997.png)
点评:求事件的概率,只要求出事件占总的基本事件的比例即可。
核心考点
试题【已知函数( )(1)若从集合中任取一个元素,从集合中任取一个元素,求方程恰有两个不相等实根的概率;(2)若从区间中任取一个数,从区间中任取一个数,求方程没有实根】;主要考察你对函数的相关概念等知识点的理解。[详细]
举一反三
(1)若大网箱的面积为108平方米,每个小网箱的横边
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200508-36691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200508-56753.png)
(2)若大网箱的面积为160平方米,网衣的造价为112元/米,筛网的造价为96元/米,且大网箱的长与宽都不超过15米,则小网箱的横、纵边分别为多少米时,可使总造价最低?
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200508-13614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200449-76866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200449-97717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200449-60287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200449-71630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-87074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-14392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-77446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-52318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200451-65597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200451-66092.png)
(1)求出
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-52318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200451-65597.png)
(2)问
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200450-52318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200429-76591.png)
A.是奇函数,且在![]() |
B.是奇函数,且在![]() |
C.是偶函数,且在![]() |
D.是偶函数,且在![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200401-70748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200401-47712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200348-87144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204200349-91935.png)
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