已知
是抛物线
的焦点,
是该抛物线上的两点,
,则线段
的中点到
轴的距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b072ff6d1b83232bebd7d4709ffba4ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1dc85723f64c4d545ccc4e4200fcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.![]() | B.1 | C.2 | D.3 |
更新时间:2021-03-26 14:33:09
|
【知识点】 抛物线的焦半径公式
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且斜率为
的直线
与抛物线
交于A(点A在第二象限),
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( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ed2bede8fe8ec670cac3a085b80cb9.png)
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A.![]() | B.![]() | C.4 | D.5 |
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单选题
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较易
(0.85)
解题方法
【推荐2】已知抛物线
,点O为坐标原点,并且经过点
,若点P到该抛物线焦点的距离为2,则
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df40ba57bb5819b4aaa38d514500052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5430c9960ff0507ade83bd23441fe98c.png)
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A.![]() | B.![]() | C.4 | D.![]() |
您最近一年使用:0次