已知圆
,圆
上的点到直线
的最短距离为
,若点
在直线
位于第一象限的部分,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c5525e3da6aaa77095380262412b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec96692748fe861f59151855f9ef394c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
更新时间:2017-06-07 20:19:32
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