名校
1 . 已知抛物线
的准线方程为
,焦点为
为抛物线上不同的三点,
成等差数列,且点
在
轴下方,若
,则直线
的方程为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65172437164e6d819b704ab28fa71c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49231e548b2015d4199d96194e943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a432648c32cf1adc1f3156025dd6d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
2016-12-04更新
|
1370次组卷
|
7卷引用:2016届西藏日喀则一中高三下学期二模理科数学试卷
名校
2 . 已知抛物线
,过点
的直线
交抛物线于
两点,坐标原点为
,
.
(1)求抛物线的方程;
(2)当以
为直径的圆与
轴相切时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e38bd48c569e650474d63f1fb16125f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a43cfb653538dd742328104a5d0ba5d.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e80cacd79b9db31e1e7c7a3e3881f9.png)
(1)求抛物线的方程;
(2)当以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
2016-12-03更新
|
900次组卷
|
8卷引用:2020届西藏山南市第二高级中学高三第一次模拟考试数学(文)试题
2011·西藏拉萨·模拟预测
3 . 给定直线
,抛物线
.
(1)当抛物线的焦点在直线
上时,求
的值;
(2)若
的三个顶点都在(1)所确定的抛物线上,且
点的纵坐标为
,
的重心恰是抛物线
的焦点,求
所在直线的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d535b1e4d1ad21c0f5dfe1588417d6bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385c3c0538c902682e9a7df24a9db1b0.png)
(1)当抛物线的焦点在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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2014高三·全国·专题练习
名校
4 . 若抛物线
上一点到焦点和抛物线的对称轴的距离分别为
和
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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