1 . 如图,已知直线
是抛物线
的准线.过焦点
的直线
交抛物线于
,
两点,过点
且与直线
垂直的直线交抛物线的准线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/27abd73b-a181-43a3-885e-43a476d36cf0.png?resizew=151)
(1)求抛物线的标准方程;
(2)求
的最大值,并求出此时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f5c558d207fa59a2cab09c33399651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.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)
![](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/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/27abd73b-a181-43a3-885e-43a476d36cf0.png?resizew=151)
(1)求抛物线的标准方程;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a13b96e3b4887e097bd00153dc66941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2020-01-17更新
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2卷引用:吉林省吉林市普通中学2019-2020学年度高三第二次调研测试数学(文)试题