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1 . 如图,网格纸的小正方形的边长是1,在其上用粗实线和粗虚线画出了某几何体的三视图,图中的曲线为半圆弧或圆,则该几何体的体积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/a9519c26-88ab-4f37-a8eb-eae9bb7eb05a.png?resizew=157)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/a9519c26-88ab-4f37-a8eb-eae9bb7eb05a.png?resizew=157)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
2019-05-28更新
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344次组卷
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3卷引用:2019届福建省龙岩市高三下学期教学质量检查数学(文)试题
2 . 如图
是图
的三视图,三棱锥
中,
,
分别是棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053137637376/1572053143724032/STEM/2ef9d197731349388b378b927544286e.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2386437c2cc4ceb51e30a4b397ed2076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ebbd866e455cf80ea669c9f56f792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391c0e2fc44598610d519dacb778062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d86a0a3e867a448094f74a54a1fee64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9febb0e53890d2fb72fdfd7f0aa88acc.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053137637376/1572053143724032/STEM/2ef9d197731349388b378b927544286e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3318c2f4e1f23bfc9631cdb066146912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45f1c831ccddb1dd250082e139cf9bd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c046f16713ac5aa1125edd19aaa36e2c.png)
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