题目内容
已知椭圆
的左、右焦点分别为F1、F2,短轴端点分别为A、B,且四边形F1AF2B是边长为2的正方形![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201158659.jpg)
(I)求椭圆的方程;
(II)若C、D分别是椭圆长轴的左、右端点,动点M满足
,连结CM交椭圆于P,证明
为定值(O为坐标原点);
(III)在(II)的条件下,试问在x轴上是否存在异于点C的定点Q,使以线段MP为直径的圆恒过直线DP、MQ的交点,若存在,求出Q的坐标,若不存在,说明理由![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201251659.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432012823126.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201095714.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201158659.jpg)
(I)求椭圆的方程;
(II)若C、D分别是椭圆长轴的左、右端点,动点M满足
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201158527.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201173473.gif)
(III)在(II)的条件下,试问在x轴上是否存在异于点C的定点Q,使以线段MP为直径的圆恒过直线DP、MQ的交点,若存在,求出Q的坐标,若不存在,说明理由
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201251659.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432012823126.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201298585.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201314445.gif)
(1)如图,由题知
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201376525.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201298585.gif)
(2)C(-2,0),D(2,0),
则可设
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432013921421.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432014238709.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432015161467.gif)
(3)设
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201532589.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201548753.gif)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/201408231432016726395.jpg)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823143201314445.gif)
![](http://thumb.zyjl.cn/images/loading.gif)
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