题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021928-74420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021928-97331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021928-61774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021928-11710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-21965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-37283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-93088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-57251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-95754.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021929-42376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-22768.png)
解析
曲线C2: x=2cosθ y=2+2sinθ (a为参数) 即 x2+(y-2)2=4,表示圆心为(0,2),半径等于2的圆.由曲线Cl、C2有公共点,可得圆心到直线的距离小于或等于半径,
∴|0+4-2a| /
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021930-21372.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021922-50546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021922-60702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021922-35625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021923-36761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021923-74714.png)
A.6 | B.0 | C.12 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021916-49731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021916-46374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021916-11264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021916-27043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021908-64015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021909-32577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021909-88214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021909-96260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021909-35781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021855-80028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021856-27585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021856-25482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021856-63718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021856-12778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-50852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-37289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-50852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-24634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-75508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-91378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021858-45285.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-75508.png)
(2)是否存在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-24634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021858-68471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021857-24634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021852-11800.png)
A.4 | B.![]() | C.![]() | D.![]() |
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