解题方法
1 . 已知圆
的圆心为
(
且
),
,圆
与
轴、
轴分别交于
,
两点(与坐标原点
不重合),且线段
为圆
的一条直径.
(1)求证:
的面积为定值;
(2)若直线
经过圆
的圆心,求圆
的方程;
(3)在(2)的条件下,设
是直线
上的一个动点,过点
作圆
的切线
,
,切点为
,
,求线段
长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3b5fe7ff4823684bcbd303eb74833a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42498f6e0fc9a61c9857b70a87f02c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)在(2)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045cf6c42c53f44921c55a01fc4cdd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803a617fb53e67edbc2955cb629c329b.png)
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2 . 点
为圆
上的两点,点
为直线
上的一个动点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42103f88b80e7ef8bb12c7b839990a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4180dae966f648d368a10edf3b7e3c3.png)
A.当![]() ![]() ![]() |
B.从点![]() ![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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3 . 古希腊数学家阿波罗尼斯在《圆锥曲线论》中证明了命题:平面内与两定点距离的比为常数k(
且
)的点的轨迹是圆,人们称之为阿氏圆.现有
,
,
.以
所在的直线为x轴,
的垂直平分线为y轴建立直角坐标系
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca036bdbb1e5583868287018beb88eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
A.点A的轨迹方程为![]() |
B.点A的轨迹是以![]() |
C.![]() |
D.当![]() ![]() ![]() |
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4 . 已知
是圆
上一点,
是直线
上一点,
为坐标原点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d347fd48ad0792d960ddd27f511bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6627e0eb86d232d27d8f1ead77a43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.直线![]() ![]() |
B.线段![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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5 . 已知圆
,直线
(
且
不同时为0),下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e709b79de786feca3b94c69ae8f38223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ac745cbcbd71c1b5ca79101866427d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7569cd7e9b31ad838230133b9bc8314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
A.当直线![]() ![]() ![]() ![]() ![]() |
B.当![]() ![]() ![]() ![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.过点![]() ![]() ![]() |
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解题方法
6 . 在平面直角坐标系
中,直线
,圆
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1f0c44c46e500a1398d1046049095d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841f406b661939b1528d61e59b579b5d.png)
A.圆![]() |
B.当![]() ![]() ![]() ![]() |
C.直线![]() ![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
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7 . 已知
,
,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97df5ceec3ec2af6d75b71dee62c0027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51159984b2cb00f30b3986315019623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7322fe6711f9925bb68973f73941a101.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知在平面直角坐标系
中,点
,
分别在
轴和
轴上(不与原点重合),满足
,坐标平面内一点
满足
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dfc9d1109fe41145cc892b5702d9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45224f7eac9d0cef64bf28d93e7721a4.png)
A.线段![]() ![]() |
B.动点![]() |
C.线段![]() ![]() ![]() |
D.动点![]() ![]() |
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9 . 在平面直角坐标系
中,对于定点
,记点集
中距离原点O最近的点为点
,此最近距离为
.当点P在曲线
上运动时,关于下列结论:①点
的轨迹是一个圆;②
的取值范围是
.正确的判断是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827539d066d1b78e7ef8bc1569864971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e591c36555576d7c404008333e8e64ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37161fc8c595651c04cd1ea5215ff237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b55515ce47257e0849b3426ef10ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e68709375ab78a2190d0907a33be85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37161fc8c595651c04cd1ea5215ff237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b55515ce47257e0849b3426ef10ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18dde3f360f3d8b0b973f5dee5d085e.png)
A.①成立,②成立 | B.①成立,②不成立 |
C.①不成立,②成立 | D.①不成立,②不成立 |
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10 . 已知圆
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
A.过点![]() ![]() ![]() |
B.过直线![]() ![]() |
C.圆O与圆![]() ![]() |
D.圆O上有2个点到直线![]() |
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