已知
,
,且
的周长等于
.
(1)求动点
的轨迹
的方程;
(2)已知点
分别为动直线
与轨迹
的两个交点,问在
轴上是否存在定点
,使
为定值?若存在,试求出点
的坐标和定值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/fd55c9f637f94f81b185ef2ee4fed542.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/fcf0dc1c4384429b875bd0a722cc010a.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/65de9ec925224d29a5720b608be627cc.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/cdc62da0bc5e4df7ab81e0f30308e37f.png)
(1)求动点
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/5c0fe07d9b9b4cd1848c3ededb9b06dd.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/cd25f299f571445a81b6bad4be510258.png)
(2)已知点
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/0568d906898d4a2fa815969a6fc0a95b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/f377f17cfb6c4b13b4ca01556d212c78.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/cd25f299f571445a81b6bad4be510258.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/96eff9f5872d47bca9055a59ac0b45d6.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/5fd31dc3fa554435b00a4fe364b2d6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1f1b2ea5d1cc60221466899198e02d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572520543559680/1572520549785600/STEM/5fd31dc3fa554435b00a4fe364b2d6e6.png)
更新时间:2016-12-04 03:24:09
|
【知识点】 平面向量的数量积
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解答题-问答题
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较难
(0.4)
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解答题-证明题
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较难
(0.4)
【推荐2】已知椭圆
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的上顶点到椭圆
的左、右顶点的距离之和为
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过点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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