名校
1 . 若平面
外的直线
的方向向量为
,平面
的法向量为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d09dd7ad583bce7523952f10580009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b150d42f3c6324cdbb22582df50d6b.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
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2024-04-02更新
|
440次组卷
|
3卷引用:江西省九江市六校2023-2024学年高二上学期期末联考数学试题
名校
2 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bf77c7d1d6c962297fe7d7622ac2f8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb885a5b92767aa3dd7b3ca28c3488ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bf77c7d1d6c962297fe7d7622ac2f8.png)
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2024-04-01更新
|
184次组卷
|
3卷引用:甘肃省武威市天祝第一中学、民勤县第一中学2023-2024学年高二下学期第一次月考数学试题
名校
3 . 如图,在三棱柱
中,底面
为等边三角形,
为
的重心,
,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c0001a835d8130df391a285e17bbbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3622e4c3d5a0c6b9b5db067a6a5563.png)
A.![]() | B.![]() |
C.![]() ![]() ![]() | D.![]() |
您最近一年使用:0次
2024-03-26更新
|
378次组卷
|
3卷引用:福建省南平市2023-2024学年高二上学期期末数学试题
4 . 在三棱锥中,
和
都是等边三角形,
,
,
为棱
上一点,则
的最小值是
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5 . 在平行六面体
中,
,
,
为
与
的交点.
(1)用向量
表示
;
(2)求线段
的长及向量
与
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeb2e4a06c21a56938e9cebd875be41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d20d9a8058985d9847ddd99046fdb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d68873c59a21b0cd408cdf2b47d51096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
您最近一年使用:0次
2024-03-24更新
|
217次组卷
|
2卷引用:山东省烟台第一中学2023-2024学年高二下学期2月月考数学试题
2024高二·全国·专题练习
6 . 已知
,空间向量
为单位向量,
,则空间向量
在向量
方向上投影的模为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145a7e8f352fab613b773dc6639b508b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739c4e6d5dfaccd771be4dd5e0e17c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
您最近一年使用:0次
名校
解题方法
7 . 如图,在平行六面体
中,
,则直线
与直线AC所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a2d3f8941eeaa03b957d1ba6a2f867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 如图,已知四边形
是边长为
的正方形,
底面
,
,设
是
的重心,
是
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/a5ac92fb-1c89-4a78-afb7-a820510b79c2.png?resizew=150)
(1)试用基底
表示向量
;
(2)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64568414c25073afaaaa2bb585d8470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a99eaeb83fb9a5ba74a9fc8f5fb18e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002a3b0ffc896755f903da63e3989576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e453b7eb2496c9d8b4668034e7d16a72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/a5ac92fb-1c89-4a78-afb7-a820510b79c2.png?resizew=150)
(1)试用基底
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1a8df2a6500d9efd065065547647db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587940d5c4389a63bd72228c64db77bc.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37911e56b9180699c76cc0eba7fe5c3.png)
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9 . 正四面体
的棱长为6,点
是该正四面体内切球球面上的动点,当
取得最小值时,
的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992907998c85cf872f6e66df0b0c1030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
您最近一年使用:0次
10 . 已知
为单位向量.
,若
,则
在
上的投影向量为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b06324471807b8928d45a68c6b971e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fcfd4bcad59c32d22624e5eea264bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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