满分5 >
高中数学试题 >
直线y=x-1上的点到圆x2+y2+4x-2y+4=0的最近距离是 .
直线y=x-1上的点到圆x2+y2+4x-2y+4=0的最近距离是 .
考点分析:
相关试题推荐
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/0.png)
的左、右焦点,A是椭圆上位于第一象限内的一点,点B也在椭圆 上,且满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/1.png)
(O为坐标原点),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/2.png)
,若椭圆的离心率等于
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/3.png)
,则直线AB的方程是 ( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835009_ST/6.png)
D.
查看答案
在圆x
2+y
2=5x内,过点(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835008_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835008_ST/1.png)
)有n条弦的长度成等差数列,最小弦长为数列的首项a
1,最大弦长为a
n,若公差d∈[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835008_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835008_ST/3.png)
],那么n的取值集合为( )
A.{4,5,6,7}
B.{4,5,6}
C.{3,4,5,6}
D.{3,4,5}
查看答案
两圆x
2+y
2+2ax+a
2-4=0和x
2+y
2-4by-1+4b
2=0恰有三条公切线,若a∈R,b∈R,且ab≠0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835007_ST/0.png)
的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835007_ST/2.png)
C.1
D.3
查看答案
已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835006_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835006_ST/1.png)
=1,F
1F
2是它的两个焦点,P是这个椭圆上任意一点,那么当|PF
1|•|PF
2|取最大值时,P、F
1、F
2三点( )
A.共线
B.组成一个正三角形
C.组成一个等腰直角三角形
D.组成一个锐角三角形
查看答案
若直线y=k(x-2)与曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/0.png)
有交点,则( )
A.k有最大值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/1.png)
,最小值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/2.png)
B.k有最大值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/3.png)
,最小值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/4.png)
C.k有最大值0,最小值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743483599/SYS201311031027297434835005_ST/5.png)
D.k有最大值0,最小值
查看答案