1 . 平面内到两个定点
的距离比值为一定值
的点
的轨迹是一个圆,此圆被称为阿波罗尼斯圆,俗称“阿氏圆”.已知平面内点
,动点
满足
,记点
的轨迹为
,则下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a08f5d6f91366da27e9b96452bb04977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e88211b53d66173e3131258ccc75b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df5d30e4268a4b86a4e098e8cb57da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f09757d013574cf058d5bb944fdf034a.png)
A.点![]() ![]() ![]() |
B.过点![]() ![]() ![]() ![]() |
C.直线![]() ![]() ![]() |
D.已知点![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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2 . 已知直线
.
(1)求证:直线
过定点;
(2)若直线
不经过第二象限,求实数
的取值范围;
(3)若直线
与两坐标轴的正半轴围成的三角形面积最小,求
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831124bef5f0e58bd6828a5a1e4f8d7c.png)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
3 . 平面几何中有一个著名的定理:
的三条高线的垂足、三边中点及三个顶点与垂心连线段的中点共圆,该圆称为
的九点圆或欧拉圆,若
,
,
的垂心为
,则
的九点圆的标准方程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1294434b22cb5133043a2270ae1c43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3326927e4b01e981a19109633141e06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f622d6680e0f8a26144dc55a1164a094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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4 . 下列四个选项中,说法错误的是( )
A.坐标平面内的任何一条直线均有倾斜角和斜率 |
B.直线![]() ![]() ![]() |
C.过![]() ![]() ![]() |
D.经过点![]() ![]() ![]() ![]() |
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解题方法
5 . 在平面直角坐标系
中,已知
的三个顶点
.
(1)求
边所在直线的方程;
(2)若
的面积等于7,且点
的坐标满足
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bdc764c2ed2acedd6b1c320f374995.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b51d8012001e4245b76af0847ab332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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解题方法
6 . 已知点
为圆
上的一点,圆心
坐标为
,且过点
的直线
被圆
截得的弦长为
.
(1)求圆
的分程;
(2)求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4258b2df7c7496adf889300faf969699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
7 . 已知圆
,直线
.则下列命题正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1cd21b824fcf58c75911fb165306d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b1adc9139ee91fef90f5ab70caf022.png)
A.直线![]() ![]() |
B.圆![]() ![]() ![]() |
C.直线![]() ![]() |
D.直线![]() ![]() ![]() ![]() |
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解题方法
8 . 在平面直角坐标系
中,直线
上有且仅有一点
,使
,则直线
被圆
截得的弦长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7376e015d8782c7acad41d46b6773c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5cb793cd3d086a324c197cf397f9399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccb79eddac2ffba071f6e95f4b7be7c.png)
A.2 | B.![]() | C.4 | D.![]() |
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解题方法
9 . 已知直线l与圆
交于M,N两点,若以MN为直径的圆过点
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549c9945f38d44a7cb19ad4441e2095a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef61fa6c5f6d4525b38e4827e2f7f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
10 . 过点
的直线
与曲线
有两个交点,则直线
斜率的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6361ceaa9240fb7b971d62a1fedf6365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90b1b85f9cf3ae8eba2591b63881073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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