在圆
上总有四个点到直线
的距离是1,则实数
的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1cd302ec87b8646a09139df8f6c5bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692265c4b64c721bd3e567b8af832b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2016-12-03 12:50:08
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【推荐1】已知
、
为圆
:
上的两个动点,且
,点
为线段
的中点,对于直线
:
上任-点
,都有
,则实数
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】在直线
上求一点,使它到直线
的距离等于原点到l的距离,则此点的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b2caf6048aa0807d8ba591963ff6e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd9c13c46413e24e4c8bb9fd810c384.png)
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【推荐1】曲线C:
与直线
:
有一个交点,则实数
的取值范围是 _________ .
![](https://img.xkw.com/dksih/QBM/2016/1/18/1572441545752576/1572441550962688/STEM/c87d526cc73d41b0bd58fb1e5c49ea4a.png?resizew=104)
![](https://img.xkw.com/dksih/QBM/2016/1/18/1572441545752576/1572441550962688/STEM/4da773301ed14c83a302020f46d9b6cf.png?resizew=9)
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![](https://img.xkw.com/dksih/QBM/2016/1/18/1572441545752576/1572441550962688/STEM/9544ac50704446788aff5e923606c9a4.png?resizew=17)
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