解题方法
1 . 某校数学期末考试中有8道单项选择题,满分40分,每道题有4个选项,其中有且仅有一个是正确的,评分标准规定:答对得5分,不答或者答错得0分.某考生每道选择题都选出了一个答案,能确定其中有4道题的答案是正确的,而其余4题中,有一道题可以排除两个错误选项,有两道题都能排除一个错误选项,还有一道题因题意理解不清,只能随机猜测.
(1)求该考生得满分40分的概率;
(2)问该考生得多少分的概率最大?
(1)求该考生得满分40分的概率;
(2)问该考生得多少分的概率最大?
您最近一年使用:0次
2022-06-27更新
|
542次组卷
|
3卷引用:四川省绵阳市江油市太白中学2023-2024学年高二下学期开学考试数学试题
解题方法
2 . 如图,抛物线
与
轴交于点
,与
轴交于点
.
(1)求抛物线的解析式;
(2)连接
,点
为线段
上的一个动点,过点
作
轴的平行线交抛物线于点
,设
点的横坐标为
,线段
长度为
.求
与
的函数关系式(不要求写出自变量
的取值范围);
(3)在(2)的条件下,连接
,是否存在
值,使
是等腰三角形?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc878a5fd7b508cf817cbb65d3940547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7291b3d921f595f28960abcdce6dfbed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/e6a8349a-a8b9-423d-9a8e-47343b555697.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/166463e2-3590-4ffb-b455-bcd541c2dbed.png?resizew=132)
(1)求抛物线的解析式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2398f658821ecd05f7cb1c6a286fda0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2023-09-20更新
|
46次组卷
|
2卷引用:四川省北川中学2023-2024学年高一上学期入学考试数学试题