已知
,直线
,
为平面上的动点,过点
作
的垂线,垂足为点
,且
.
(1)求动点
的轨迹曲线
的方程;
(2)设动直线
与曲线
相切于点
,且与直线
相交于点
,试探究:在坐标平面内是否存在一个定点
,使得以
为直径的圆恒过此定点
?若存在,求出定点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5899b11dbeffe6fe5cad8e2375d27d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7519e0e1e77101433a1d6a26f3d88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/e8a35b6cf7624b0eb7e424ae2df858a3.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/afa4ad15abe54a55b6201b2b00a92192.png)
(2)设动直线
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/b34bbea5d0014b9f95ea33303aaba25a.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/afa4ad15abe54a55b6201b2b00a92192.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/e987ef4b4169491aaeded0e8632d9714.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/972ad836b8684a54bcb6edfe9acceebe.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/bcc997f718494049b28f142b13af4044.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/fa554ed48fa448bfa22bf0ce62ee3676.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
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更新时间:2016-12-02 08:26:51
|
【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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容易
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