圆
与圆
的公切线条数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbd813114eee1248780beaa7d277b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/534e1f407c5caa4b2cb1134bfc48a26e.png)
更新时间:2021-02-04 07:17:47
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【知识点】 圆的公切线条数
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【推荐2】已知圆
:
和
:
恰好有三条公切线,则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55200e840ea42d96f10038dea7cee5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5479e95f55bba47988a3be0cf084fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097b9d484b2f7a747527fd3042ee3738.png)
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