名校
解题方法
1 . 已知平面直角坐标系中的点集
,给出下列四个结论:
(1)当直线
为
时,
与
没有公共点;
(2)存在直线
与
有且只有一个公共点;
(3)存在直线
经过
中的无穷个点;
(4)存在直线
与
没有公共点,且
中存在两点在
的两侧.
其中所有正确结论的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482b22844099dc1c909cc42fd75b4fd5.png)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(4)存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
其中所有正确结论的序号是
您最近一年使用:0次
2023-05-23更新
|
740次组卷
|
4卷引用:北京市海淀区2023届高三数学查缺补漏题(1)
北京市海淀区2023届高三数学查缺补漏题(1)北京市中关村中学2023届高三三模数学练习试题北京市第一零一中学2023届高三三模数学统考四试题(已下线)2.1.3 直线与圆的位置关系(八大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)
2 . 为了解某地区居民每户月均用电情况,采用随机抽样的方式,从该地区随机调查了
户居民,获得了他们每户月均用电量的数据,发现每户月均用电量都在
之间,进行适当分组后(每组为左闭右开区间),得到如下频率分布直方图:
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900011722899456/2915739091656704/STEM/91aec52b-58a0-419c-a7e6-70b5634e1543.png?resizew=335)
(1)记频率分布直方图中从左到右的分组依次为第
组、第
组、
、第
组,从第
组、第
组中任取
户居民,求他们月均用电量都不低于
的概率;
(2)根据上述频率分布直方图,估计月均用电量的样本数据的第
百分位数;
(3)该地区为提倡节约用电,拟以每户月均用电量为依据,给该地区月均用电量不少于
的居民用户每户发出一份节约用电倡议书,且发放倡议书的数量为该地区居民用户数的
.请根据此次调查的数据,估计
应定为多少合适?(只需写出结论).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790e2b2ad866f333b5bfae9eda8b6522.png)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900011722899456/2915739091656704/STEM/91aec52b-58a0-419c-a7e6-70b5634e1543.png?resizew=335)
(1)记频率分布直方图中从左到右的分组依次为第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5440465fcd339327df4e3cd70288ddb1.png)
(2)根据上述频率分布直方图,估计月均用电量的样本数据的第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
(3)该地区为提倡节约用电,拟以每户月均用电量为依据,给该地区月均用电量不少于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ac1c235e7d960c2095836f38ef77e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a32a7dc4004cc5d940f8f6197e90ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
您最近一年使用:0次
2022-02-13更新
|
433次组卷
|
2卷引用:北京市海淀区2023届高三数学查缺补漏题(2)