1 . 若抛物线
上一点
到其焦点的距离为4.则点
的坐标为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2018-01-24更新
|
630次组卷
|
2卷引用:天津市红桥区2017-2018学年高二上学期期末考试数学(文)试题
12-13高二上·天津·期末
名校
解题方法
2 . 已知
是抛物线
的焦点,过
且斜率为
的直线交
于
两点.设
,则
的值等于_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee19ddf562596b5b5eadf5cba9ae8041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa05d5575e2b5e7aeb1c1303064f4eef.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571151277416448/1571151283068928/STEM/00e67c22ecc6496491cc0642ca2e7c98.png?resizew=31)
您最近一年使用:0次
3 . 一动圆过点A(0,1),圆心在抛物线
上,且恒与定直线
相切,则直线
的方程为 ________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次