我国古代数学《九章算术》中,有个“井深几何”问题:今有井径五尺,不知其深,立五尺木于井上,从木末望水岸,入径四寸(1尺=10寸),问井深几何?其意思如图所示,则井深BD的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/879a3247-a626-417b-b1e0-2eaf32ff868a.png?resizew=89)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/879a3247-a626-417b-b1e0-2eaf32ff868a.png?resizew=89)
A.12尺 | B.56尺5寸 | C.57尺5寸 | D.62尺5寸 |
19-20九年级上·吉林长春·期末 查看更多[8]
更新时间:2019-02-16 11:14:52
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【推荐1】如图,
是斜靠在墙上的一个梯子,梯脚
距墙
,梯上点
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,
长
,则梯子的长为( )
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A.3.5m | B.3.85m | C.4m | D.4.2m |
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【推荐2】如图是用卡钳测量容器内径的示意图,现量得卡钳上A,D两个端点之间的距离为10cm,
,则容器的内径是( )
![](https://img.xkw.com/dksih/QBM/2019/5/29/2213958724345856/2214301090553856/STEM/c25779310ca34c639eb8f2e89b2c6ac1.png?resizew=111)
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A.5cm | B.10cm | C.15cm | D.20cm |
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