题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033154-61911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-61378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-61035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-50951.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-61035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033156-55645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033157-40075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033157-70908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-50951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033157-23949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033157-29215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-50951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033158-58989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033158-71081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-42486.png)
点评:直线与圆相交的问题,要借助图形数形结合来解决,可以简化运算.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-24938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-81632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-64142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-74670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-52207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-97942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
(1)求证:△
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-39107.png)
(2)设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-90870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-77321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-64269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-96370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-92709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033146-96868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033139-98916.png)
A.(x-3)2+y2=25 | B.(x-3)2+y2=25或(x-7)2+y2=25 |
C.(x±3)2+y2=25 | D.(x+3)2+y2=25或(x+7)2+y2=25 |
A.1 | B.![]() | C.2![]() | D.3 |
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033125-38231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033125-67661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033125-83569.png)
(Ⅰ)证明:对任意
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033125-68455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-39215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-39215.png)
(Ⅱ)设以CN为直径的圆为圆D(D为CN中点),求证圆D的方程为:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-67761.png)
(Ⅲ)设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-39215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-73808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-67761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-15825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033127-50897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033126-15825.png)
已知圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033119-46646.png)
(Ⅰ)若△ABC的重心是G(
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033119-35893.png)
(Ⅱ)若直线AB与直线AC的倾斜角互补,求证:直线BC的斜率为定值.
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