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1 . 棱长为4的正方体
中,E,F分别为棱
,
的中点,若
,则下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72545bef56c4e32d1b76489bd32c3842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17230625e72d3a9c6d72ff61019ff61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f83044285fd2454d070d0ba68c2bdab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7265a048c572531048c11147b04f4e.png)
A.三棱锥![]() |
B.二面角![]() ![]() |
C.当![]() ![]() |
D.当![]() ![]() |
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2022-10-17更新
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4卷引用:黑龙江省哈尔滨德强学校2022-2023学年高二(清北AB班)上学期期中考试数学试题(A卷)
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2 . 如图,正方体
的棱长为
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/7d23bbb7-f319-4328-a51c-f180968314ee.png?resizew=178)
(1)求点
到平面
的距离;
(2)求二面角
的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/7d23bbb7-f319-4328-a51c-f180968314ee.png?resizew=178)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb2a344518d4d3a9b443129a869ab44.png)
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3 . 如图,在四棱锥
中,底面
是菱形,
,
,
,
底面
,
,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5f861a4f-d7cb-4a21-8a71-6b1bc5b4be21.png?resizew=216)
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
(3)求四面体
的体积.
![](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/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc72a44dad13532cb9ddcc64bd78105.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5f861a4f-d7cb-4a21-8a71-6b1bc5b4be21.png?resizew=216)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f178906e90bafd73e0ef9f89814855d5.png)
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2022-09-29更新
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4332次组卷
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3卷引用:黑龙江省大庆市大庆铁人中学2022-2023学年高一下学期期末数学试题
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解题方法
4 . 在长方体
中,O为
与
的交点,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7685ea3de3b41c6216c8f2379d2bad2.png)
A.![]() |
B.![]() |
C.三棱锥![]() ![]() |
D.二面角![]() ![]() |
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2022-09-29更新
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3卷引用:黑龙江省牡丹江市第二高级中学2021-2022学年高一下学期期末考试数学试题
5 . 如图,四棱锥
的底面
是边长为2的菱形,
,E为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074790710706176/3075522167324672/STEM/f4a018d195b145d4b56b8cbbecdff09d.png?resizew=252)
(1)证明:
平面
;
(2)求三棱锥
的体积;
(3)求二面角
的余弦值.
![](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/e8a3ccc06bd57e73c7fb9c22e242d0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074790710706176/3075522167324672/STEM/f4a018d195b145d4b56b8cbbecdff09d.png?resizew=252)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb178784aa857d4d4683e650273f054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95e78927443bbadb5bf60f1c836ea24.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
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解题方法
6 . 在正四面体A-BCD中,二面角A-BC-D的余弦值是_______ .
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2022-09-20更新
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2卷引用:黑龙江省杜尔伯特蒙古族自治县第一中学2021-2022学年高一下学期第二次月考数学试题
7 . 如图(1),平面四边形ABDC中,∠ABC=∠D=90°,AB=BC=2,CD=1,将△ABC沿BC边折起如图(2),使______,点M,N分别为AC,AD中点.在题目横线上选择下述其中一个条件,然后解答此题.
①
;②AC为四面体ABDC外接球的直径;③平面ABC⊥平面BCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/feabb2fa-5a14-4e8a-be3a-b69d1bf05727.png?resizew=329)
(1)判断直线MN与平面ABD是否垂直,并说明理由;
(2)求二面角
的正弦值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7650cede07c4758a9b3bb1da4553acc5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/feabb2fa-5a14-4e8a-be3a-b69d1bf05727.png?resizew=329)
(1)判断直线MN与平面ABD是否垂直,并说明理由;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0912d666aa93db05c94bb8c0368a9790.png)
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2022-07-23更新
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13卷引用:黑龙江省哈尔滨市第九中学校2021-2022学年高一下学期期末数学试题
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8 . 在正方体
中,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.与![]() | B.直线![]() ![]() |
C.直线![]() ![]() | D.二面角![]() ![]() |
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9 . 在四棱锥
中,
,
,
,
,
平面
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025088080814080/3026862934368256/STEM/b521fcc1e84b45a39da0c0646c01d943.png?resizew=246)
(1)求证:平面
面
;
(2)若
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff70a54a149a15fb96b7e1e8406c98ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025088080814080/3026862934368256/STEM/b521fcc1e84b45a39da0c0646c01d943.png?resizew=246)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
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2022-07-20更新
|
1233次组卷
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3卷引用:黑龙江省哈尔滨市第三中学校2021-2022学年高一下学期期末考试数学试题
黑龙江省哈尔滨市第三中学校2021-2022学年高一下学期期末考试数学试题(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》福建省福州日升中学2022-2023学年高一下学期期末考试数学试题
10 . 如图,在三棱柱
中,侧面
为菱形,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/8384f515-56df-4ad7-80e6-94445554cf8d.png?resizew=222)
(1)证明:平面ABC⊥平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e3c9e7c05de9838c0c5d762720d3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399572bdc5816897500121034d1100c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4fcf607b0710d12aaabd17fd053d83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/8384f515-56df-4ad7-80e6-94445554cf8d.png?resizew=222)
(1)证明:平面ABC⊥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185729402f3b20ac3e0b003be9b385eb.png)
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2022-07-08更新
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7卷引用:黑龙江省哈尔滨市第四中学校2022-2023学年高一下学期期末数学试题
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