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直线l将圆:x2+y2-2x-4y=0平分,且不过第四象限,那么l的斜率的取值范...
直线l将圆:x2+y2-2x-4y=0平分,且不过第四象限,那么l的斜率的取值范围是 .
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过原点的直线与圆x
2+y
2+4x+3=0相切,若切点在第三象限,则该直线的方程是
.
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直线y=x-1上的点到圆x
2+y
2+4x-2y+4=0的最近距离是
.
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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.
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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}
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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
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