在直角坐标
平面内,已知点
,直线
,
为平面上的动点,过
作直线
的垂线,垂足为点
,且
.
(1)求动点
的轨迹
的方程;
(2)过点
的直线交轨迹
于
两点,交直线
于点
,已知
,
,,试判断
是否为定值,若是,求出该定值;若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/9333efc378f145469249cb34bfcd8c61.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/eb1b752f673f4c5bb6c0ec2b55024bda.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/12d563c1d32c4b8fb8249492f1a49204.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b15e9d31b27b4416836aa3cb2f38ded1.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b15e9d31b27b4416836aa3cb2f38ded1.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b8ee7084c0eb415db543cfb08e258a3e.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/9fa8a50a86684b6e87d5d3544d7cced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22079f0b22a3f24455cea4ebc6531464.png)
(1)求动点
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b15e9d31b27b4416836aa3cb2f38ded1.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b92703f8e7134989ab438ac02ed046ce.png)
(2)过点
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/7aaaa1a459c24e959f02c2601944070b.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b92703f8e7134989ab438ac02ed046ce.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/d9216750fd7441a9b3fec2fa2b7ede3c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/b8ee7084c0eb415db543cfb08e258a3e.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/8daf2843c9dc467f99ad2e58119df48a.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/2c83f3339af44137b0864076864b424c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/28b9d0ab61a540bd877bc524501773d4.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572334134910976/1572334141308928/STEM/81f1145e2b414c2f8b8e6d1d12ac5bce.png)
更新时间:2016-12-03 21:04:54
|
【知识点】 向量在几何中的应用
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a560b8ff794c12dc8d194bcd2e3f3554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
(2)求与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3cc805723d3ecc95b4472d13bb1bb6.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
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