题目
题型:不详难度:来源:
平面直角坐标系中,已知曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023941-64704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023941-85158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023941-15617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023941-85925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-57231.png)
(1)试写出曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-57231.png)
(2)在曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-57231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-90015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-90015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-51810.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-79019.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-69398.png)
此时
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-83142.png)
解析
(1)曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-48058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-73663.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-76103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-95144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023944-15392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023944-27552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-79019.png)
(2)由(1)得点
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023944-63902.png)
点
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023944-95251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023945-94211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023945-87354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023945-28415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023942-69398.png)
此时
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023943-83142.png)
核心考点
试题【选修4-4:坐标系与参数方程平面直角坐标系中,已知曲线,将曲线上所有点横坐标,纵坐标分别伸长为原来的倍和倍后,得到曲线(1)试写出曲线的参数方程;(2)在曲线上】;主要考察你对极坐标与直角坐标等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023937-42087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023928-82450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-26649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-63092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-97554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-72568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023930-35924.png)
(1)将直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023928-82450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-72568.png)
(2)判断直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023928-82450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023929-72568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-45619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-82263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-89160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-20884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-55011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-45619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-89160.png)
(2)求两个圆ρ=4cosθ
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023923-34313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023917-18016.png)
A.(2,![]() | B.(2,![]() | C.(2,-![]() | D.(-2,-![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108023912-65242.png)
A.x2+(y+2)2=4 | B.x2+(y-2)2=4 | C.(x-2)2+y2=4 | D.(x+2)2+y2=4 |
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