1 . 设
是以定点
为球心半径为
的球面,
是一个固定平面,
到
的距离为
.设
是以点
为球心的球面,它与
外切并与
相切.令A为满足上述条件的球心
构成的集合.设平面
与
平行且在
上有A中的点.设
是平面
与
之间的距离.则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f562eb3c2a45d65cba066d712825a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f50605db5d5f8f3a01ee8e474a112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2d70c47444cb333ff8d68e36a52181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f50605db5d5f8f3a01ee8e474a112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2d70c47444cb333ff8d68e36a52181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b2d4d75dec1ac907231fa1ce4e459a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32c36fe601a5d0c26e1bdb0f8f66366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f562eb3c2a45d65cba066d712825a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2d70c47444cb333ff8d68e36a52181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2d70c47444cb333ff8d68e36a52181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907e10e5b0927b534415bc6e23fd0841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2d70c47444cb333ff8d68e36a52181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907e10e5b0927b534415bc6e23fd0841.png)
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