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设P为圆x2+y2=1上的动点,则点P到直线3x-4y-10=0的距离的最小值为...
设P为圆x2+y2=1上的动点,则点P到直线3x-4y-10=0的距离的最小值为 .
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圆C:x
2+y
2-2x-4y+4=0的圆心到直线3x+4y+4=0的距离d=
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已知点P(1,2,3),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516010_ST/0.png)
,它们在面xoy内的射影分别是P',Q',则
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=
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直线x-2y-3=0与圆(x-2)
2+(y+3)
2=9交于E,F两点,则△EOF(O是原点)的面积为( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516009_ST/2.png)
D.
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若圆x
2+y
2-4x-4y-10=0上至少有三个不同的点到直线l:ax+by=0的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516008_ST/0.png)
,则直线l的倾斜角的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516008_ST/3.png)
D.
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