在我国古代数学名著《九章算术》中,将底面为直角三角形且侧棱垂直于底面的棱柱称为堑堵.已知三棱柱
为一堑堵,
,
,
,
,则直线
与直线
夹角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabe764f05300ac83c7d16b685d27af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
A.![]() | B.![]() | C.![]() | D.![]() |
22-23高二上·天津南开·期中 查看更多[2]
更新时间:2022-11-06 10:25:38
|
【知识点】 求异面直线所成的角
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单选题
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解题方法
【推荐1】在正三棱台
中,E,F分别是棱
,
的中点,且
,则异面直线AE与BF所成的角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526285fdbbe361c8dc618da8e2c1e208.png)
A.30° | B.45° | C.60° | D.90° |
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单选题
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【推荐2】正方体的平面展开图如图,则在这个正方体中,以下四个结论中,正确结论的序号是( )
①
与
平行;②
与
异面直线③
与
成
角:④
与
是异面直线
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/51e427c4-ca57-4d48-9719-41952ea771df.png?resizew=169)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/51e427c4-ca57-4d48-9719-41952ea771df.png?resizew=169)
A.①②③ | B.②④ | C.③④ | D.①③④ |
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