选修4-4:坐标系与参数方程.
已知直线
(
为参数),曲线
(
为参数).
(Ⅰ)设
与
相交于
两点,求
;
(Ⅱ)若把曲线
上各点的横坐标压缩为原来的
倍,纵坐标压缩为原来的
倍,得到曲线
,设点
是曲线
上的一个动点,求它到直线
的距离的最小值.
已知直线
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/a64cd616ca0448928733ad3129c6cef4.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/01a8054ebb024ec6b6eb07ccffbf953c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/2d2fa277cd37430196d05bd7d2095a3e.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/fcc1c57ae6234d95873d9fb693f82f5b.png)
(Ⅰ)设
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/f1dbbf5955da46839145b4927d84bf66.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/8d14625f50234ba797e2d4ee9afd5fa9.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/b2af487f6e23408aaa1b5ac532c6f514.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/df00ccf969504cf184c84c6654e6d9a3.png)
(Ⅱ)若把曲线
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/8d14625f50234ba797e2d4ee9afd5fa9.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/0bae38413686460fb2832d893c29f913.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/6f2b39ba6bdd4627aa7bf5c75ffdd19c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/7cda8af55b51498db1146b221bf59500.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/58d1937125734603b5b7dc3784d9b521.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/7cda8af55b51498db1146b221bf59500.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572360612536320/1572360618500096/STEM/f1dbbf5955da46839145b4927d84bf66.png)
更新时间:2019-01-30 18:14:09
|
【知识点】 曲线的参数方程
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】在平面直角坐标系
中,直线
的参数方程为
(
为参数),以
为极点,
轴非负半轴为极轴建立极坐标系,曲线
的极坐标方程为
.写出直线
的普通方程和曲线
的直角坐标方程;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257d09224a859efadbb26b28e60a5f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd16120f984696519517c1df3f0d9b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】已知极坐标系中,点
,曲线
的极坐标方程为
,以极点为原点,极轴为
轴的正半轴建立平面直角坐标系,直线
的参数方程为
(
为参数).
(1)求直线
的极坐标方程;
(2)把曲线
上各点的横坐标扩大到原来的5倍,纵坐标扩大到原来的6倍,得到曲线
,
为
上的动点,求线段
的中点
到直线
距离的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f3c3ebc629593bda5764f57522d706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094ab3a9f3a40f6fc88a4184371dc745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad24691ed8019dc601a335c583c728dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)把曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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