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1 . 在空间中,定义向量的外积:
叫做向量
与
的外积,它是一个向量,满足下列两个条件:
①
,且
和
构成右手系(即三个向量的方向依次与右手的拇指、食指、中指的指向一致,如图所示);
②
的模
,(
表示向量
的夹角).
在正方体
中,有以下四个结论,其中正确的个数是( )
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf465dbdbb97df06cbb668a0caab531.png)
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374ffe66ac359919c6ccb6fc23c90719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4e6bae1b67a0a1eeafdd1114a792df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2415182608ea28c5626bb4caa4bb876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4e6bae1b67a0a1eeafdd1114a792df.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4e6bae1b67a0a1eeafdd1114a792df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79aaaba0041132d267beaa869cfe7462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eaf5dcdb83f75f8b6d005f334276681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
在正方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/8d6baaf8-6d99-45ee-8381-17d953b3c489.png?resizew=178)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119500455321db933290deef516d157c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf465dbdbb97df06cbb668a0caab531.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e8ae1d35bff6823c1f606945137a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374ffe66ac359919c6ccb6fc23c90719.png)
A.1 | B.2 | C.3 | D.4 |
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解题方法
2 . 如图,一个结晶体的形状为平行六面体
,其中,以顶点
为端点的三条棱长均为6,且它们彼此的夹角都是
.则
与
所成角的余弦值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/2d2a739e-d555-4a28-8ed8-40f139a56b41.png?resizew=150)
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名校
3 . 已知直线
:
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0985b973395bcd371cd1e26d3fcd1c36.png)
A.直线![]() ![]() |
B.过点![]() ![]() ![]() |
C.向量![]() ![]() |
D.若直线![]() ![]() ![]() |
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4 . 《九章算术》中将四个面都为直角三角形的四面体称为鳖臑.如图,在鳖臑
中,
平面
,
平面
,
为
的中点,
.
(1)设
,
,
,用
表示
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9edf677346f7ceba0e70a51395bbf98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/133f9b0b-3482-47bc-b382-1a824ab8dd1d.png?resizew=186)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d9ac737639ad7ce99887f9ef07685c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20a9410ceb649e303910f8efe5f7531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ab526047942ab1767de848538d1ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8c53645db602c72b00b599c2c0ff97.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27a1d6706cd035223361c988868dac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2372bef75fa2ba16e360b552fcf6cd.png)
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2023-10-27更新
|
199次组卷
|
10卷引用:四川省眉山市仁寿第一中学校南校区2023-2024学年高二上学期12月阶段性模拟测试数学试题
四川省眉山市仁寿第一中学校南校区2023-2024学年高二上学期12月阶段性模拟测试数学试题贵州省遵义市2023-2024学年高二上学期10月月考数学试题贵州省普通高中部分学校2023-2024学年高二上学期第一次联考数学试题辽宁省部分高中2023-2024学年高二上学期10月月考数学试题陕西省西安市昆仑中学2023-2024学年高二上学期10月月考数学试题山西省部分名校2023-2024学年高二上学期10月联考数学试题内蒙古部分名校2023-2024学年高二上学期10月联考数学试题广东省佛山市南海区第一中学2023-2024学年高二上学期第一次大测(10月)数学试题广东省深圳市名校2023-2024学年高二上学期期中联考数学试题内蒙古自治区第二地质中学2023-2024学年高二上学期10月月考数学试题
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5 . 下列关于空间向量的命题中,正确的有( )
A.直线![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.若非零向量![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2023-10-24更新
|
655次组卷
|
5卷引用:四川省江油市太白中学2023-2024学年高二上学期期中数学试题
6 . 在三棱锥
中,满足
,
,给出下列结论:
①
; ②若
是锐角,则
;
③若
是钝角,则
是钝角; ④若
且
,则
是锐角.
其中正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35333abd7f02d663d15251bc5cbbf921.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4668ef024c694c0517c46af5e563495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5695ba6ee3f7466b4b32c2e9340abf1.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149b1f4a7300425e6682e41d5f095377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f8fcbe6d923d1f5ba46a695756eb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
其中正确结论的序号为( )
A.①②④ | B.①④ | C.②③ | D.②④ |
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2023高二·全国·专题练习
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7 . 在四面体
中,下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
A.若![]() ![]() |
B.若Q为![]() ![]() |
C.若![]() ![]() ![]() |
D.若四面体![]() ![]() |
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2023-10-20更新
|
385次组卷
|
3卷引用:四川省江油市太白中学2023-2024学年高二上学期期中数学试题
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解题方法
8 . 已知在空间直角坐标系
中,点
的坐标分别是
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9aa44ff10f3a8185e2d6bd88d9ecfad.png)
(1)求点
到直线
的距离.
(2)判断点
是否共面,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f3a0f66bacf0d50bd22079147fde42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57612e5fab3ae53788671cec875750d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9aa44ff10f3a8185e2d6bd88d9ecfad.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f3a0f66bacf0d50bd22079147fde42.png)
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解题方法
9 . 在正三棱柱
中,
;点
是线段
的中点,点
满足
,其中
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0e44cb429eea46e7ee4320147192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6b545127bd51036a5a7b0d3cd5b320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf326510f76018d51105bb42c195ca3.png)
A.当![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
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10 . 空间向量
,则下列选项中可能成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5026cafdf91272822f489d9de20e317e.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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