1 . 已知
是抛物线
的焦点,
为抛物线上的动点,且
的坐标为
,则
的最小值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3befeadb23509605a146f5474dce6fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a24c56292fa7ef1fb5a3c6cabc790a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2016-12-04更新
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8卷引用:江西省景德镇一中2022-2023学年高二(重点班)上学期期中考试数学试题
名校
2 . 已知点A(5,0),抛物线C:y2=4x的焦点为F,点P在抛物线C上,若点F恰好在PA的垂直平分线上,则PA的长度为( )
A.2 | B.![]() | C.3 | D.4 |
您最近一年使用:0次
2016-12-04更新
|
425次组卷
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5卷引用:2015-2016学年江西省上饶中学高二重点班下学期第一次月考数学试卷
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3 . 已知抛物线
:顶点在坐标原点,
轴为对称轴,且过点
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/6af0c233-fb8f-409b-bf70-82870dcefc83.png?resizew=142)
(1)求抛物线
的方程;
(2)已知抛物线
的准线为
,焦点为
,若点
为直线
:
上的动点,设点
横坐标为
.试讨论
,确定圆心在抛物线
上,与
相切,且过点
的圆的个数?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/6af0c233-fb8f-409b-bf70-82870dcefc83.png?resizew=142)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512f4c29ff276b7f35052ad4cc255ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2016-12-03更新
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541次组卷
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2卷引用:江西省吉水中学2022-2023学年高二上学期期末考试数学试题