1 . 在平面直角坐标系
中,点
的坐标分别是(0,-3),(0,3),直线
相交于点
,且它们的斜率之积是
.
(1)求
的轨迹C方程;
(2)若直线l经过点
,与轨迹C有且仅有一个公共点,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55fb7ec4aa413693f4ecae59fe0e2084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若直线l经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e30486708397d6c3a36bd18bbdef96d.png)
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解题方法
2 . 在平面直角坐标系xoy中,点A,B的坐标分别是
,直线AM、BM相交于点M,且它们的斜率之积是
.
(1)求 M的轨迹C的方程;
(2)若直线l经过点
,与轨迹C有且仅有一个公共点,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a89dd3c5cc32be2d1adb48309f1132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
(1)求 M的轨迹C的方程;
(2)若直线l经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8115c09f801cf0bb02293baef7bf137.png)
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14-15高二上·山东威海·期末
3 . (1)已知点
和
,过点
的直线
与过点
的直线
相交于点
,设直线
的斜率为
,直线
的斜率为
,如果
,求点
的轨迹;
(2)用正弦定理证明三角形外角平分线定理:如果在
中,
的外角平分线
与边
的延长线相交于点
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b00c7d98aa59fe7e9b6001181ba542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabe26428ae2ee27c6b5743c111de405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229bf788cc03a5fa05826a1923709a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)用正弦定理证明三角形外角平分线定理:如果在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7adc97ebf4359db48dd4df96cc4d1b8.png)
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