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以下四个关于圆锥曲线的命题中 ①设A、B为两个定点,k为非零常数,||-||=k...
以下四个关于圆锥曲线的命题中
①设A、B为两个定点,k为非零常数,|
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|-|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225028088528849/SYS201311012250280885288014_ST/1.png)
|=k,则动点P的轨迹为双曲线;
②设定圆C上一定点A作圆的动点弦AB,O为坐标原点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225028088528849/SYS201311012250280885288014_ST/2.png)
=
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(
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+
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),则动点P的轨迹为椭圆;
③方程2x
2-5x+2=0的两根可分别作为椭圆和双曲线的离心率;
④双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225028088528849/SYS201311012250280885288014_ST/6.png)
-
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=1与椭圆
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+y
2=1有相同的焦点.
其中真命题的序号为
(写出所有真命题的序号)
考点分析:
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