已知平面上动点P到定点
的距离比P到直线
的距离大1.记动点P的轨迹为曲线C.
(1)求曲线C的方程;
(2)过点
的直线
交曲线C于A、B两点,点A关于x轴的对称点是D,证明:直线
恒过点F.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63309dbc3612815f6dbdee23d9a10adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
(1)求曲线C的方程;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc8350b12974ffc8d06fce36d158f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2020-02-09 20:09:50
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相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】已知抛物线C:x2=2py(p>0),过焦点F的直线交C于A,B两点,D是抛物线的准线l与y轴的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/edbc7eef-92c5-4d28-9fb1-cb1584e3aab7.png?resizew=216)
(1)若AB∥l,且△ABD的面积为1,求抛物线的方程;
(2)设M为AB的中点,过M作l的垂线,垂足为N.证明:直线AN与抛物线相切.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/edbc7eef-92c5-4d28-9fb1-cb1584e3aab7.png?resizew=216)
(1)若AB∥l,且△ABD的面积为1,求抛物线的方程;
(2)设M为AB的中点,过M作l的垂线,垂足为N.证明:直线AN与抛物线相切.
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【推荐2】已知圆
的圆心
在抛物线
上,圆
过原点且与抛物线的准线相切.
(1)求该抛物线的方程;
(2)过抛物线焦点
的直线
交抛物线于
,
两点,分别在点
,
处作抛物线的两条切线交于
点,求三角形
面积的最小值及此时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c8b9d00cbc349a58d7af49ecc7cecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c2f156b05838deaae6a35acad242af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求该抛物线的方程;
(2)过抛物线焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐1】已知点
在抛物线
上,
为抛物线
上两个动点,
不垂直
轴,
为焦点,且满足
.
(1)求
的值,并证明:线段
的垂直平分线过定点;
(2)设(1)中定点为
,当
的面积最大时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763353a1abb8ed4d79f18bc73418a44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e1bc08cc69d3d8e73b990f1236ed5c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)设(1)中定点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】已知点A,B关于坐标原点O对称,
,圆M过点A,B且与直线
相切,记圆心M的轨迹为曲线
.
(1)求曲线
的方程;
(2)过曲线
上的动点P作圆G:
的切线
,
,交曲线
于C,D两点,对任意的动点P,都有直线
与圆G相切,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236f52e04ddbd7253f44b97c4756ef9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ede20ce638de73ac52d3c58122fd7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
(2)过曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3322a46c7a347f874eb72161c0183c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次