已知
方程
表示圆,则
的取值范围为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f8e7a6e86f331925745519ba71397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b0d4a3bbffed4d2eea0d711e510cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
20-21高二上·内蒙古赤峰·阶段练习 查看更多[3]
内蒙古宁城蒙古族中学2020-2021学年第一学期高二联考数学(理)试题江苏省扬州市江都区邵伯高级中学2022-2023学年高二上学期10月阶段性测试(一)数学试题(已下线)2.4.2 圆的一般方程(分层作业)(3种题型分类基础练+能力提升练)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第一册)
更新时间:2020-11-22 13:10:36
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【知识点】 二元二次方程表示的曲线与圆的关系
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【推荐1】已知曲线
.则下列命题正确的是______ .
①若
,则
是椭圆,其焦点在
轴上
②若
,则
是圆,其半径为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
③若
,则
是双曲线,其渐近线方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1004e11a5ef46b2db577ed722c2ee96.png)
④若
,
,则
是两条直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff41b0435e120094baed2e8e37353ec.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66eba129d92ede31b728e2590c4db2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ba433823cf6f0c5d158fa909f9f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdc69abbcdf98c42b649f8d8d4cd1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1004e11a5ef46b2db577ed722c2ee96.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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