某广场内供休闲人员休息的石凳是由一个正方体石块截去8个相同的四面体得到的,如图所示,若被截正方体石块棱长为
,则该石凳的体积为( )(单位
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9871f2a312aaf3a19b40e4fb1a7693b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6d1d99afa158b4ba4fc0dae562fcc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/d0d26c52-3f76-45d2-9f03-1a7b156a6bc6.png?resizew=314)
A.180000 | B.160000 | C.140000 | D.120000 |
更新时间:2023-06-10 00:06:29
|
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较易
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解题方法
【推荐1】如图,一个四棱柱形容器中盛有水,在底面
中,
,
,
,侧棱
,若侧面
水平放置时,水面恰好过
的中点,那么当底面
水平放置时,水面高为( )![](https://img.xkw.com/dksih/QBM/2021/3/8/2673593772195840/2675030664921088/STEM/21e39ce4-97b5-4e17-9b97-e3ddd987e0f3.png?resizew=224)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce11fb18a9acdfe609342f5e37633e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/3/8/2673593772195840/2675030664921088/STEM/21e39ce4-97b5-4e17-9b97-e3ddd987e0f3.png?resizew=224)
A.2 | B.![]() | C.3 | D.![]() |
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【推荐2】如图,某三棱柱的正视图是边长为2的正方形,其上下底面为正三角形,则下列命题中一定成立的是
![](https://img.xkw.com/dksih/QBM/2018/12/9/2093247311503360/2093686354042880/STEM/fcee8e5f70534e95bb94cc3f95ffb46e.png?resizew=137)
![](https://img.xkw.com/dksih/QBM/2018/12/9/2093247311503360/2093686354042880/STEM/fcee8e5f70534e95bb94cc3f95ffb46e.png?resizew=137)
A.该三棱柱的表面积为![]() |
B.该三棱柱的体积为![]() |
C.该三棱柱的侧视图为矩形 |
D.该三棱柱有外接球 |
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名校
解题方法
【推荐1】用一个平行于圆锥
底面的平面截该圆锥得到一个圆台,若圆台上底面和下底面半径之比为
,则该圆台与圆锥
的体积之比为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图为某四面体的三视图,则该几何体的体积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/02d8dece-539a-4166-8d20-30b8df88a447.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/02d8dece-539a-4166-8d20-30b8df88a447.png?resizew=163)
A.![]() | B.![]() | C.![]() | D.![]() |
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