已知
,点P为抛物线
上一动点,点P到直线
的距离是
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b73e6777246f78353fc101dd1bc619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0b4679fc5506923ca30e9ca2015333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d2b01f86fb5a373af6b089cf3d891b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ac26f4bcd918999fefcd855c7c190e.png)
A.![]() | B.![]() | C.![]() | D.3 |
更新时间:2020-02-01 11:24:19
|
【知识点】 抛物线上的点到定点和焦点距离的和、差最值
相似题推荐
单选题
|
较易
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【推荐1】抛物线y2=2px(p>0)的焦点为F,过点M(p ,0),倾斜角为45°的直线与抛物线交于A、B两点,若|AF|+|BF|=10,则抛物线的准线方程为( )
A.x+1=0 | B.2x+1=0 |
C.2x+3=0 | D.4x+3=0 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】设抛物线
的焦点为
,经过点
的直线
与抛物线相交于
两点,点
恰为
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1d93f21f39ebf95b5929b456814246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f13bf66fc845b115de4ec45b4be0e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248f9bb8dd23ab0fa70e774678d91641.png)
A.8 | B.10 | C.14 | D.16 |
您最近一年使用:0次