1 . 某公园里有一些石墩,每张石墩是由正方体石料截去八个一样的四面体得到的,如图所示,一张石墩的体积是
,那么原正方体石料的体积是________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830f9727e3e32f7b930f1e7d266be45e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eab9bcb68861b73f12a65eb9e94700d.png)
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名校
2 . 如图,在四棱锥
中,底面
是边长为2的正方形,侧棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
底面
,
,
是
的中点,作
交PB于点
.
![](https://img.xkw.com/dksih/QBM/2022/9/27/3075522905776128/3081229997236224/STEM/01fb833bf9d14b5885c78f4b54747a23.png?resizew=213)
(1)求三棱锥
的体积;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
平面
;
(3)求平面
与平面
的夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d4c42112e0a22f240ce2ae432e5b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/9/27/3075522905776128/3081229997236224/STEM/01fb833bf9d14b5885c78f4b54747a23.png?resizew=213)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ee3afb7e2c8943673449a1b136faf0.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce46aeb97373353179e5669365fa4a.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955e030d649a3c7885071b4bf849993c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2022-10-05更新
|
2286次组卷
|
6卷引用:天津市新四区示范校2022-2023学年高二下学期期末联考数学试题
天津市新四区示范校2022-2023学年高二下学期期末联考数学试题天津市五校联考2021-2022学年高一下学期期末数学试题(已下线)空间直线、平面的垂直(已下线)8.6.2 空间角与空间距离(精练)-2022-2023学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)专题强化训练四 直线与平面所成的角、二面角的平面角的常见解法(2)-《考点·题型·技巧》(已下线)高一下学期期末数学考试模拟卷02-2022-2023学年高一数学下学期期中期末考点大串讲(人教A版2019必修第二册)
解题方法
3 . 如图,正方体
的棱长为2,E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/6e31eef9-cf9e-45f0-9833-63d7c28b9f28.png?resizew=200)
(1)证明:
平面BDE;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/6e31eef9-cf9e-45f0-9833-63d7c28b9f28.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89006cac018a9875f65ed7bd429c61bf.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c65e66df8ef6b562fe0066023a6e83.png)
您最近一年使用:0次
2022-07-08更新
|
687次组卷
|
2卷引用:2023年天津市河东区普通高中学业水平合格性考试模拟数学试题