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动点P(x,y)到两定点F1(0,-3),F2(0,3)的距离和10,则点P的轨...
动点P(x,y)到两定点F1(0,-3),F2(0,3)的距离和10,则点P的轨迹方程为 .
考点分析:
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已知直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856011_ST/0.png)
交椭圆x
2+9y
2=9于A、B两点,若|AB|=2,则k的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856011_ST/3.png)
D.
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直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856010_ST/0.png)
与椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856010_ST/1.png)
相交于A,B两点,该椭圆上点P,使得△PAB面积等于3,这样的点P共有( )
A.1个
B.2个
C.3个
D.4个
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若双曲线x
2-y
2=1的右支上一点P(a,b)到直线y=x的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856009_ST/0.png)
,则a+b的值为( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856009_ST/2.png)
C.±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856009_ST/3.png)
D.±2
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双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231417543885605/SYS201311012314175438856008_ST/0.png)
上一点P,设F
1为双曲线的左焦点,F
2为双曲线的右焦点,∠F
1PF
2=90°,则△F
1F
2P的面积为( )
A.8
B.16
C.5
D.4
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