1 . 在
中,
,
,D是AB的中点.将
沿CD翻折,得到三棱锥
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630d82ae0ed6deb825514e0bc92e74a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
A.![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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2 . 如图,在五面体ABCDE中,平面ABCD⊥平面ABEF,四边形ABCD与四边形ABEF全等,且
,
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/366e96ff-b2d9-4677-93e0-d235d372f9b1.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2ed27ad118ce1479d0168f82b0ce76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9c8118da6497773855883f36bcbe4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/366e96ff-b2d9-4677-93e0-d235d372f9b1.png?resizew=153)
A.![]() |
B.若G为棱CE中点,则DF⊥平面ABG |
C.若AD=CD,则平面ADE⊥平面BDE |
D.若![]() |
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3 . 已知正方体
的棱长为
,点
是棱
上的定点,且
,点
是棱
上的动点,则三棱锥
的体积最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9878a063abcb6098d10560f2bf2d4b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c5ba735c7c726f10f3f9cdc34121f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e2ff2540234f564c7e53760c92a230.png)
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4 . 如图,在四棱锥
中,四边形
是等腰梯形,
.
分别是
的中点,且
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/1cbf98ad-109a-4488-bdc9-c09e898e3008.png?resizew=190)
(1)证明:
平面
;
(2)已知三棱锥
的体积为
,求二面角
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/2e263d46c107fa79a457b642ba035340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7490886e2807c7b8a4fa57d99c4dc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397dab2cc39244e41e1744214cccb204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/1cbf98ad-109a-4488-bdc9-c09e898e3008.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)已知三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63cd98983166c6f861b82f45bff0e179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c764736ec31656bbd4fe87ca8a593506.png)
您最近一年使用:0次
2021-03-23更新
|
705次组卷
|
5卷引用:江苏省南京市第一中学2021-2022学年高三上学期期初学情调研数学试题
名校
5 . 如图,在四棱锥
中,侧面
底面
,底面
平行四边形,
,
,
,
为
的中点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/8f076fdd-bdff-40df-a12e-325f688630ca.png?resizew=184)
(1)求证:
;
(2)试确定点
的位置,使得直线
与平面
所成的角和直线
与平面
所成的角相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62526e69e7c4e59d9df8a5b2c2426400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692300f1ba0c83d7ffd4d0c6f36c9232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/8f076fdd-bdff-40df-a12e-325f688630ca.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6c62979a7aa534a191d8387a741e8.png)
(2)试确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2019-12-07更新
|
275次组卷
|
11卷引用:江苏省南京市二十九中2020-2021学年高二下学期期初数学试题
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