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过原点O作圆x2+y2-6x-8y+20=0的两条切线,设切点分别为P、Q,则线...
过原点O作圆x2+y2-6x-8y+20=0的两条切线,设切点分别为P、Q,则线段PQ的长为 .
考点分析:
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若点O和点F分别为椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732009_ST/0.png)
的中心和左焦点,点P为椭圆上的任意一点,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732009_ST/1.png)
的最大值为( )
A.2
B.3
C.6
D.8
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如图,正方体ABCD-A
1B
1C
1D
1的棱长为1,线段B
1D
1上有两个动点E、F,且EF=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732008_ST/0.png)
,则下列结论中错误的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732008_ST/images1.png)
A.AC⊥BE
B.EF∥平面ABCD
C.三棱锥A-BEF的体积为定值
D.△AEF的面积与△BEF的面积相等
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设O为坐标原点,F
1,F
2是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/1.png)
=1(a>0,b>0)的焦点,若在双曲线上存在点P,满足∠F
1PF
2=60°,|OP|=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/2.png)
a,则该双曲线的渐近线方程为( )
A.x±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/3.png)
y=0
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/4.png)
x±y=0
C.x±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/5.png)
y=0
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392073294/SYS201311031013293920732007_ST/6.png)
x±y=0
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