1 . 如图,在空间四边形ABCD中,
为BC的中点,
在CD上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/6807b55f-87a0-4ad1-b100-8061fe1f6bd0.png?resizew=140)
(1)以
为基底,表示
;
(2)
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7827aa402bd800d692718aee108840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ef0a99a25b115e054452abff205544.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/6807b55f-87a0-4ad1-b100-8061fe1f6bd0.png?resizew=140)
(1)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c5d7ba714351d679bbbb287af5aaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae54940f33b8714da5fe3b7546f8b3dc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e89f12071eecf9f5f9f80ebdff28f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd881ddf4b86bced8c7cba28ba6fc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28baa3ec1ef83511eff382dcc0c885be.png)
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2 . 下列四个命题中为假命题 的是( )
A.已知![]() ![]() ![]() ![]() ![]() |
B.已知向量![]() ![]() ![]() |
C.已知![]() ![]() ![]() |
D.已知![]() ![]() |
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194次组卷
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2卷引用:河北新乐市第一中学等2023-2024学年高二上学期期末联考数学试卷
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3 . 如图,长方体
中,
,
,点
为线段
上一点,则
的值可以为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/85978082-bc52-4599-a995-7c7bd85022c9.png?resizew=124)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dfaf9472aa24ab8bc1072a91760827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd03a79b08fac84501768b34cfe3357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dc44f32a06762871bd4f5f97129995.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/85978082-bc52-4599-a995-7c7bd85022c9.png?resizew=124)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-02-24更新
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2卷引用:河北新乐市第一中学等2023-2024学年高二上学期期末联考数学试卷
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解题方法
4 . 如下图,二面角
的棱上有两个点
,
,线段
与
分别在这个二面角的两个面内,并且都垂直于棱
.若
,
,
,
,则平面
与平面
的夹角的余弦值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc75b0de577ae69af3d7bce59339b719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/5ae97ac5-ab08-4098-8590-30b103bbfb6a.png?resizew=160)
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5 . 正三棱柱
中,底面边长为
,侧棱长为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1817297374e431a1d9087dcc2991d3a9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3c1e54f0318d3fab1742308cad4bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1817297374e431a1d9087dcc2991d3a9.png)
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解题方法
6 . 如图,平行六面体
的校长均为3,且
两两向量的夹角都是
,过
的平面
与
分别交于点
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d68873c59a21b0cd408cdf2b47d51096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89992744fb42d976f786bbd7e562770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be3b7305d6c181420ea7b28c420851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6468ff8e4060f4a603b907920c856d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/60cceea0-2ec5-4c8f-b7d0-90e6811d10b9.png?resizew=226)
A.截面![]() |
B.![]() |
C.![]() ![]() |
D.平行六面体![]() ![]() |
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7 . 已知正方体
的棱长为2,M为棱
的中点,P,Q分别为线段
,
上的动点,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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8 . 已知
,
,若
与
垂直,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b84d0ae262958ffd8ebc45c1295e42b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a17d6af0af641f6491e9da930c475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
A.![]() | B.![]() | C.2 | D.![]() |
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解题方法
9 . 如图,正三棱柱
的各条棱长都为2,M,N分别是AB,
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/a6bbcc06-147d-4830-91c9-10d3ee0d9c3f.png?resizew=129)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/a6bbcc06-147d-4830-91c9-10d3ee0d9c3f.png?resizew=129)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
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2024-02-14更新
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2卷引用:河北省唐山市2024届高三上学期期末数学试题
10 . 在棱长为2的正四面体A-BCD中,E,F分别是AD,BC的中点,G是△BCD的重心,则下列结论正确的是( )
A.![]() | B.![]() |
C.![]() ![]() ![]() | D.![]() |
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