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1 . 在《九章算术》中,将底面为矩形且有一条侧棱与底面垂直的四棱锥称之为阳马.如图,若四棱锥
为阳马,侧棱
底面
,且
,
,设该阳马的外接球半径为
,内切球半径为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187de07874b5370c4489cb4a2dff0b1.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0689e5d1fed5db814a5a2ae7dc0907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187de07874b5370c4489cb4a2dff0b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/ba028436-597c-4194-9206-003666ee8d62.png?resizew=185)
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2019-05-07更新
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5卷引用:贵州省铜仁市石阡县民族中学2023届高三上学期期末联考数学模拟试题