问题:
直线
:
与圆M:
相切,则
的值为
A.1或-6
B.1或-7
C.-1或7
D.1或![](http://picflow.koolearn.com/upload/papers//20140823/20140823222431056332.png)
直线
:
与圆M:
相切,则
的值为
![](http://picflow.koolearn.com/upload/papers//20140823/20140823222430853280.png)
![](http://picflow.koolearn.com/upload/papers//20140823/20140823222430869608.png)
![](http://picflow.koolearn.com/upload/papers//20140823/20140823222430900724.png)
![](http://picflow.koolearn.com/upload/papers//20140823/20140823222430916337.png)
A.1或-6 | B.1或-7 | C.-1或7 | D.1或![]() |
参考答案: