名校
解题方法
1 . 已知圆
与圆
,在下列说法中:
①对于任意的
,圆
与圆
始终相切;
②对于任意的
,圆
与圆
始终有四条公切线;
③
时,圆
被直线
截得的弦长为
;
④
分别为圆
与圆
上的动点,则
的最大值为4
其中正确命题的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f1dc81fb995b3023d56f82ff964a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a2314d1f465b9940f08e0b5f55f88a.png)
①对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe211e0dea7a44863e5e1706633c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
②对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe211e0dea7a44863e5e1706633c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee117579f5fc3944bbf7f342f50e450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601d4c79cdabd1a49a6b8e6d026e663f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b09e2d46f94b9ca3caf3f8283619c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2a0f156c21a6d3387e9c5a15b373d1.png)
其中正确命题的序号为
您最近一年使用:0次
2022-10-13更新
|
975次组卷
|
8卷引用:江苏省无锡市南菁高级中学2023-2024学年高二上学期10月月考数学试题
名校
2 . 设直线系
:
,对于下列三个命题:
①
中所有直线均与一个定圆相切;
②
中所有直线均经过一个定点;
③存在点
不在
中的任一条直线上.
其中真命题的序号为____________ (写出所有真命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee014177faf3f62276d699606ca5bf05.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
③存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
其中真命题的序号为
您最近一年使用:0次