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1 . 如图是一座山峰的示意图,山峰大致呈圆锥形,峰底呈圆形,其半径为
,峰底A到峰顶S的距离为
,B是山坡
上一点,且
,
.为了发展当地旅游业,现要建设一条从A到B的环山观光公路.若从A出发沿着这条公路到达B的过程中,要求先上坡,后下坡.则当公路长度最短时,
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890f0b4e81634bb7e013412698640f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e5b0c286d936091a2cd7d1f55861f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b97172405c4f7ac60fb19651cc62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb6bf23a5a12e1ba5413594d7b1a57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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