如图所示,直三棱柱
的所有棱长均相等,点D为
的中点,点E为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947492456726528/2948197200707584/STEM/9b5f946b-1299-44bd-ab8a-b2216485d728.png?resizew=139)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
平面
;
(2)若三棱锥
的体积为
,求该三棱柱的外接球表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947492456726528/2948197200707584/STEM/9b5f946b-1299-44bd-ab8a-b2216485d728.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c2bd5eaf71f8866c0979fa299df50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a8b76e36783a69d14ec54af82c7df0.png)
更新时间:2022-03-31 18:25:28
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在图1中,四边形ABCD为梯形,
,
,
,
,过点A作
,交BC于E.现沿AE将△ABE折起,使得
,得到如图2所示的四棱锥
,在图2中解答下列两问:
(1)求四棱锥
的体积;
(2)若F在侧棱BC上,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6610676353016a9f7235d306b731c1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df793f5dac174bc71bd1e82bbf5732b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4999d4fbcbe15f78c29d518f25d317c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99be23ddbd80e2c75649e3d1f8594130.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/8bf162d8-a6c7-47ee-9e39-90a6beb98105.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/359e2c09-f4c2-49db-a8cb-e218f70f9578.png?resizew=149)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99be23ddbd80e2c75649e3d1f8594130.png)
(2)若F在侧棱BC上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386e945cb8ffa5288ba68b0714ea9e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade6931be0db4f7a771bb764c88c80d9.png)
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解答题-问答题
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适中
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解题方法
【推荐2】如图,已知平行四边形
中,
,E为
的中点,将
沿直线
翻折成
,若M为
的中点,则
在翻折过程中(点
平面
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ae9d4c92-61a9-4970-b253-3be30f68e082.png?resizew=208)
(1)证明:
平面
;
(2)当平面
平面
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b8a3d69da78c7a3e8edd2c82261ad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c72495428bbbd12cad3271b0654ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ae9d4c92-61a9-4970-b253-3be30f68e082.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
(2)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac48b9ac8efbf41d6ab5242d247bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483f030abf61c6a0882d656d63cf4512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5e227de890c03cb865aac85131718b.png)
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(0.65)
名校
【推荐1】如图,在四棱锥
中,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/26c43374-da65-4401-b193-ec024e91c231.png?resizew=121)
(1)证明:
是正三角形﹔
(2)若
,三棱锥
的四个顶点
在同一球面上,求该球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a150d2c56d15a7154e2a6d02f13989e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb12b271663dfd4f605a24fa853381b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/26c43374-da65-4401-b193-ec024e91c231.png?resizew=121)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a1219bc313db46b07bbd68600267a4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d352b45ba7850c84e054ed9131de29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7826e3c6a53025324df827b39c9f7db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6361d87d2ef0bb6662c20e9b23d7727b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】有一个倒圆锥形容器,它的轴截面是一个正三角形,在容器内放一个半径为
的铁球,并注入水,使水面与球正好相切,然后将球取出,求这时容器中水的深度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://img.xkw.com/dksih/QBM/2017/11/30/1828551778770944/1829627055398912/STEM/f416188f8f844d57bcbf2f3de556053f.png?resizew=198)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在三棱柱
中,
,
,
,
分别是线段
上的点,且
,
平面
,侧面
底面
.
(1)求证:
平面
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb717228e1762d335814a3adc90eae45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70d708336d4f15e7fca0b26acb353b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d061c7a9c98768ead226c27bdfd2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcae2ed229b0b3c325be19c88ad6b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f491a794b9ac1a85a18c87ecee616c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/21a08fc0-b062-429a-8a8f-9a92d2d5d26a.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250833a6c405ffd724b673b478c22919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dec7387a27d33abe134c7a1e29a3aa0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】已知直三棱柱
,
,
,
,
分别为
,
,
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a8446c35-c50f-4508-b952-b6df98e40a06.png?resizew=148)
(1)求证:
平面
;
(2)求
;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af2626608f61a4cfbb86494bd6df0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4bf0cd5d0f1cd6dee1eee88d34e0ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a8446c35-c50f-4508-b952-b6df98e40a06.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757ef0bdb7fbd0e05acf10023b011527.png)
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