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若直线3x-4y+12=0与两会标轴交点为A、B,则以线段AB为直径的圆的方程是...
若直线3x-4y+12=0与两会标轴交点为A、B,则以线段AB为直径的圆的方程是 .
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已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891011_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891011_ST/1.png)
=1(a>b>0)的左、右焦点为F
1,F
2,P为椭圆上的一点,且|PF
1||PF
2|的最大值的取值范围是[2c
2,3c
2],其中c=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891011_ST/2.png)
.则椭圆的离心率的取值范围为( )
A.[
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,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891011_ST/4.png)
]
B.[
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,1)
C.[
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,1)
D.[
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,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891011_ST/8.png)
]
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已知直线ax+by+c=0(abc≠0)与圆x
2+y
2=1相切,则三条边长分别为|a|、|b|、|c|的三角形( )
A.是锐角三角形
B.是直角三角形
C.是钝角三角形
D.不存在
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直线x-y+4=0被圆x
2+y
2+4x-4y+6=0截得的弦长等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891009_ST/2.png)
D.
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设P是60°的二面角α-l-β内一点,PA⊥平面α,PB⊥平面β,A,B为垂足,PA=4,PB=2,则AB的长为:( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891008_ST/2.png)
D.
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椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891007_ST/0.png)
的两个焦点为F
1、F
2,过F
1作垂直于x轴的直线与椭圆相交,一个交点为P,则P到F
2的距离为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891007_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102032276989114/SYS201311031020322769891007_ST/3.png)
D.4
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