如图,设P是圆x2+y2=2上的动点,点D是P在x轴上的投影.M为线段PD上一点,且
.
(1)当点P在圆上运动时,求点M的轨迹C的方程;
(2)已知点F1(﹣1,0),F2(1,0),设点A(1,m)(m>0)是轨迹C上的一点,求∠F1AF2的平分线l所在直线的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1f6e397cb026c7d91a45a77d41cc29.png)
(1)当点P在圆上运动时,求点M的轨迹C的方程;
(2)已知点F1(﹣1,0),F2(1,0),设点A(1,m)(m>0)是轨迹C上的一点,求∠F1AF2的平分线l所在直线的方程.
![](https://img.xkw.com/dksih/QBM/2012/2/28/1570780828237824/1570780833824768/STEM/50e8eb25dea845fcb48e1c8f8551589f.png?resizew=106)
2012·广东云浮·一模 查看更多[1]
(已下线)2012届广东省云浮中学高三第一次模拟考试文科数学
更新时间:2016-12-01 16:24:41
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【知识点】 轨迹问题——椭圆
相似题推荐
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】设
,动圆
与
轴相切于
点,如图,过
两点分别作圆
的非
轴的两条切线,两条切线交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/362848c8-c685-4089-89fa-f7e4bb4dc7a4.png?resizew=263)
(1)证明:
为定值,并写出点
的轨迹方程;
(2)设动直线
与圆
相切,又
与点
的轨迹交于
两点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/795cfa355eb3188f2d2a9b8909b02faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/362848c8-c685-4089-89fa-f7e4bb4dc7a4.png?resizew=263)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3a530363f0113d0870aa6a65f50c3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)设动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7db9b4ac9106bfaf32eba6ae265872b.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】在平面直角坐标系
中,已知向量
,
,且
.
(1)求动点
的轨迹
的方程;
(2)已知直线
过坐标原点,且与(1)中的轨迹
交于
两点,
在第三象限,且
轴,垂足为
,连接
并延长交
于点
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2369cf534ac61a39d44505db1d3feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31624b56550dabf85ad2a404cc37aa75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9438290e091f16568b6ca49f937b377.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379051d5400af1d76194365a687c98f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知直线
![](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/e7490886e2807c7b8a4fa57d99c4dc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcec4050ad922c18239c38effcc45403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b0249db15011b3eb8fb2902718557a5.png)
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