用多种方法推导圆的标准方程:
,圆心为
,半径为r.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b353454a5807af1cf768f43245197c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
2023高三·全国·专题练习 查看更多[1]
(已下线)第三节 圆的方程 讲
更新时间:2023-08-25 15:22:33
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【推荐1】已知圆
,圆
.
(Ⅰ)试判断圆
与圆
的位置关系;
(Ⅱ)在直线
上是否存在不同于
的一点
,使得对于圆
上任意一点
都有
为同一常数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2648f2824f2c8073a9f240271963663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46b02686d8d331d07901bdc0bf79fc9.png)
(Ⅰ)试判断圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
(Ⅱ)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baea4fd7a86d2325b4e256f42b7e1551.png)
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【推荐2】已知平行四边形ABCD的周长为20,对角线AC的长为6,用坐标法求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a0abdf3eea0772418890031971fb56.png)
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【推荐1】已知圆O:
上的点到直线
的最小距离为1,设P为直线
上的点,过P点作圆O的两条切线PA、PB, 其中A、B为切点.
(1)求圆O的方程;
(2)当点P
为直线
上的定点时,求直线AB的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3503d330608e7138d1b529aba4512fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352a927b3f7509f6d3c6e2b4fb26ad06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(1)求圆O的方程;
(2)当点P
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6a4781b020b879519321e05c299f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】已知椭圆
(
)的两个顶点分别为
和
,两个焦点分别为
和
(
),过点
的直线
与椭圆相交于另一点
,且
.
(1)求椭圆的离心率;
(2)设直线
上有一点
(
)在
的外接圆上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578faa3e92d60d4741a360898e46ce61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c201f240bb837f99d10af1564e573a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5076829e649b3f3866d4a7e07a5713e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697c20fca284394bf5d5b9e5f6d952e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56cb147ec43dbf7dcb3e5dd8d4af3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91eb19c3255f443868a46a9843cc84f0.png)
(1)求椭圆的离心率;
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c429b542abf0ebee74a239b4857cf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb536d6ebc0fb831f9505cec8a83b68d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9793e563df4c56df01f619202465075d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ab7024f73ff0cb7e6a48197538a91e.png)
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