题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-27884.png)
(1)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-27884.png)
(2)圆C的圆心在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-17577.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-51623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-23631.png)
解析
试题分析:(1)由直线的两点式方程
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-33413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-79733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-17577.png)
试题解析:(1)由题可知:直线l经过点(2, 1), (6, 3),由两点式可得直线l的方程为:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-19174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-51623.png)
(2)依题意:设圆C的方程为:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-91581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-46479.png)
,∵圆心C在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-51623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-48052.png)
∴k=-1,∴圆C的方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144222-49961.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144221-23631.png)
核心考点
举一反三
在空间若两条直线不相交,则它们一定平行;②平行于
同一条直线的两条直线平行;③一条直线和两条平行直线
中的一条相交,那么它也和另一条相交;④空间四条直线
a,b,c,d,如果a∥b,c∥d,且a∥d,那么b∥c.
A.①②③ | B.②④ | C.③④ | D.②③ |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144210-25629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144210-69005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144210-58677.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144200-78889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144201-39477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144201-37255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144201-39466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144201-74245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144202-43023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144202-34319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144202-74101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144202-11886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144202-70043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144155-65561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144156-51076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144156-77699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144148-21986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144149-85060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022144149-63912.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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