已知
的周长为18,且
,建立适当的平面直角坐标系,求顶点
的轨迹方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
23-24高二上·上海·课后作业 查看更多[1]
(已下线)2.5 曲线与方程
更新时间:2023-09-11 21:10:41
|
【知识点】 利用椭圆定义求方程
相似题推荐
解答题-计算题
|
较易
(0.85)
解题方法
【推荐1】已知动点
满足:
(其中
).
(1)指出动点
的轨迹
是何种曲线,并化简其方程;
(2)当
时,若过点
的直线
和曲线
相交于
两点,且
为线段
的中点,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ff7e0ef1f622120cc1b18e9d3e80ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88927a5c8dfa3414f5a82e83f7ccc531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
(1)指出动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260f5fe6e3637a415344ff137c7a6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9deb20b57fe0b94ca8520b55298d6c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】为了监测某海域的船舶航行情况,海事部门在该海域,设立了如图所示东西走向,相距
海里的
,
两个观测站,观测范围是到
,
两观测站距离之和不超过
海里的区域.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/c2a373ba-06d1-4e31-81b6-d10c53ad7ee3.png?resizew=164)
(1)以
所在直线为
轴,线段
的垂直平分线为
轴建立平面直角坐标系,求观测区域边界曲线的方程;
(2)某日上午7时,观测站B发现在其正东10海里的C处,有一艘轮船正以每小时8海里的速度向北偏西45°方向航行,问该轮船大约在什么时间离开观测区域?(精确到1小时).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/c2a373ba-06d1-4e31-81b6-d10c53ad7ee3.png?resizew=164)
(1)以
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)某日上午7时,观测站B发现在其正东10海里的C处,有一艘轮船正以每小时8海里的速度向北偏西45°方向航行,问该轮船大约在什么时间离开观测区域?(精确到1小时).
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