1 . 古希腊著名数学家阿波罗尼斯发现:平面内到两个定点距离之比为定值
(
且
)的点的轨迹是圆,此圆被称为“阿波罗尼斯圆”.在平面直角坐标系
中,已知点
,圆
:
,若圆
上存在点
,使得
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472393b18c7880e73b40e31fbe2d951c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8fa7727c355f98b13e49a6ccf64ecee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297af2859ce6975fe9cbff4158300d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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2 . 直线
、
为圆
与
的公切线,设
、
的夹角为θ,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70feca8eac775ebee7b6d9760e2be6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee38661eb85acfa0e86898faed4c008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 椭圆
任意两条相互垂直的切线的交点轨迹为圆:
,这个圆称为椭圆的蒙日圆.在圆
上总存在点
,使得过点
能作椭圆
的两条相互垂直的切线,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad08a3366008d82b08962f6a99de6de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833bf16f0161259e9d973dbdd5c6b18c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b5bdfb2e0806a5623eea4ab4ae9dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6dba18751d6641f9fa02f5756be97a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知两圆
和
有公共点则r的值可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732d975ac17a0c0525115ba02f1ed3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c57d3295e224f040cd8600df7fef293.png)
A.![]() | B.1 | C.6 | D.8 |
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5 . 已知两圆
.则下列说法中,正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bba7f714fd1d247afb650e0c1766af.png)
A.若![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.若圆![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() |
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6 . 已知圆
,过直线
上一点
向圆
作两切线,切点为
、
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c87531c3e3346663fe16c8eff34956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.直线![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.满足![]() ![]() |
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7 . 已知圆
,直线
,点P为
上一动点.过点P作圆M的切线
,切点为
,当
最小时,直线
的方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f85591e60e4312115c5068564b114b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbb5f75f035bc58830b9df835287b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9ce08214287236b3eb3f490a15e28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 下列命题正确的是( )
A.直线![]() ![]() |
B.圆![]() ![]() |
C.若圆![]() ![]() ![]() |
D.函数![]() ![]() |
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9 . 已知
是圆
与圆
的公共点,则
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94165c5047e68e952df7a8dc6dc32fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd767240a603ca0c0db5567707eb704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3e9808f373c303a79dd828dc1de613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
A.3 | B.![]() | C.![]() | D.![]() |
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10 . 已知圆
,圆
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8eb4a90a7a1dabef7b6ca2dd45345b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64af8d9c32c4886698f81f000e39d7c4.png)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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