抛物线的顶点为
、焦点为
.当动点
在抛物线上移动时,求距离比
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/2bb0549d610b575aad07e1ddea528361.png)
2012高三·山西·竞赛 查看更多[1]
(已下线)2012年全国高中数学联赛山西赛区预赛试题
更新时间:2018-12-14 10:49:20
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【知识点】 直线与二次曲线方程及性质
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,椭圆
,抛物线
,过抛物线
上一点P(异于原点0)作切线
,与椭圆
交于A、B两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/be921f7d-8b92-48e0-b04c-e04dea6d71fb.png?resizew=206)
求:(1)切线
在x轴上的截距的取值范围;(2)△AOB面积S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6533a2123bcaa8c7dcd36d5e3f37700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c7fc8e284e4aafd93a630d50a53930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/be921f7d-8b92-48e0-b04c-e04dea6d71fb.png?resizew=206)
求:(1)切线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知抛物线
,
是过焦点
的弦.如果
与
轴所成的角为
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994c0cb1e435532f108c00d28f2437a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60015ee538906996f588e2de81e9694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/07f1d377-114c-420d-b964-24d20c95b377.png?resizew=129)
您最近一年使用:0次