满分5 >
高中数学试题 >
与三条直线y=0,y=x+2,y=-x+4都相切的圆的圆心是( ) A.(1,2...
与三条直线y=0,y=x+2,y=-x+4都相切的圆的圆心是( )
A.(1,2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611010_ST/0.png)
+2)
B.(1,2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611010_ST/1.png)
-3)
C.(1,3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611010_ST/2.png)
-3)
D.(1,-3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611010_ST/3.png)
-3)
考点分析:
相关试题推荐
曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611009_ST/0.png)
与直线y=k(x-1)+2有两个交点时,实数k的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611009_ST/1.png)
≤k>1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611009_ST/3.png)
≥K≥1
D.1≥k<
查看答案
不论k为何实数,直线(2k-1)x-(k+3)y-(k-11)=0恒通过一个定点,这个定点的坐标是( )
A.(5,2)
B.(2,3)
C.(5,9)
D.(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611008_ST/0.png)
,3)
查看答案
一束光线从点A(-1,1)出发,经x轴反射到圆C:(x-2)
2+(y-3)
2=1上的最短路程是( )
A.3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611007_ST/0.png)
-1
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611007_ST/1.png)
C.4
D.5
查看答案
过定点(1,3)可作两条直线与圆x
2+y
2+2kx+2y+k
2-24=0相切,则k的取值范围是( )
A.k>2
B.k<-4
C.k>2或k<-4
D.-4<k<2
查看答案
如果直线y=ax+2与直线y=3x-b关于直线y=x对称,那么( )
A.a=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611005_ST/0.png)
,b=6
B.a=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988961166/SYS201311012310429889611005_ST/1.png)
,b=-6
C.a=3,b=-2
D.a=3,b=6
查看答案