已知曲线C上一点P到点F
的距离比它到
轴的距离大
;过点
且斜率为1的直线与C交于
两点.
(1)求曲线C的方程;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28491f7ef64389d62b0e1574ab56429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc8350b12974ffc8d06fce36d158f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d4cadeffffd9480a95a17109570dca.png)
(1)求曲线C的方程;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238469e628fb2c454f176be31552cd0c.png)
更新时间:2021-12-15 09:50:05
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【推荐1】已知点P与点
的距离比它到直线
的距离小2.
(1)求点P的轨迹C的方程;
(2)若轨迹C上有两点A、B在第一象限,且
,
,求证:直线AB的斜率是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12dab697596b2417f0f2e945113bc40.png)
(1)求点P的轨迹C的方程;
(2)若轨迹C上有两点A、B在第一象限,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d14d9d1f3ca9ef57e9ce260999dc609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368fc197b61e01fe6a4a168bb7b375cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
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解题方法
【推荐2】(1)若点
到直线
的距离比它到点
的距离小
,求点
的轨迹方程.
(2)设椭圆
的离心率为
,焦点在
轴上且长轴长为
,若曲线
上的点到椭圆
的两个焦点的距离的差绝对值等于
,求曲线
的标准方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)设椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954795d1842974a705f9468f3b952ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
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解答题-问答题
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(0.85)
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【推荐1】已知抛物线的顶点是坐标原点
,焦点
在
轴的正半轴上,过焦点
且斜率为
的直线
与抛物线交于
两点,且满足
.
(1)求抛物线的方程;
(2)已知
为抛物线上一点,若点
位于
轴下方且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59411f424d59bc4de8f2b2e124fdbba9.png)
(1)求抛物线的方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】已知抛物线
上第一象限的一点
到其焦点的距离为2.
(1)求抛物线C的方程和
点坐标;
(2)过点
的直线l交抛物线C于A、B,若
的角平分线与y轴垂直,求弦AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf92a1ba410263d4f68b7e0432b19aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408dd68a7003b3f04133973ff5509b33.png)
(1)求抛物线C的方程和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e970c7f3475d3fbfa01d06a3b43dd4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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