名校
解题方法
1 . 在平面直角坐标系中,动点
(
)到点
的距离与到
轴的距离之差为1.
(1)求点
的轨迹
的方程;
(2)若
,过点
作任意一条直线交曲线
于
,
两点,试证明
是一个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ff7e0ef1f622120cc1b18e9d3e80ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19934cfed158057bc208f942f898fe2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c699a757a7ee06c063150def9c5dffa.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b0a9091b9f2f980536350127691fa7.png)
您最近一年使用:0次
2018-03-11更新
|
958次组卷
|
5卷引用:2018年湖南省高三十四校联考文科数学
2018年湖南省高三十四校联考文科数学(已下线)2018年高考数学备考中等生百日捷进提升系列(综合提升篇) 专题05 解析几何解答题(已下线)《高频考点解密》—解密23 曲线与方程(已下线)解密21 曲线与方程-备战2018年高考文科数学之高频考点解密重庆市南开中学校2021-2022学年高二上学期11月月考数学试题
2 . 已知抛物线
的焦点
与椭圆
的一个焦点重合,点
在抛物线上,过焦点
的直线
交抛物线于
、
两点.
(1)求抛物线
的标准方程以及
的值.
(2)记抛物线的准线
与
轴交于点
,试问是否存在常数
,使得
,且
都成立.若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29e9ff132637709ce7c3f58cfcd4da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7585c7944d095b903c6e0d3dcbc228e.png)
![](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)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8aed33984ccc91282d8a1c2be27cd0.png)
(2)记抛物线的准线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e87088da41685cc8d433fbbe0e18d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce97701a2f599401f400a604ae0c66d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47335c411abfddcfe3e7d64e94bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2017-11-18更新
|
1169次组卷
|
3卷引用:湖南师大附中2018届高三上学期月考试卷(三)(11月) 数学文
解题方法
3 . 已知直线
的斜率为
,它与抛物线
相交于
两点,
为抛物线的焦点, 若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a9a49dc8499d6c3b73d633e20b9757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ab21cf4f8f8ffa5dafd65eeb72c99a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
911次组卷
|
3卷引用:2017届湖南师大附中高三上入学摸底文科数学试卷
4 . 设抛物线C:y2=4x的焦点为F,过F的直线l与抛物线交于A,B两点,M为抛物线C的准线与x轴的交点,若tan ∠AMB=2
,则|AB|=____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
您最近一年使用:0次
2016-12-04更新
|
755次组卷
|
5卷引用:湖南省长沙市第一中学2023-2024学年高二上学期期末考试数学试题