在长方体
中,
,
,则异面直线
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/fe9d26aa29b3abf4889d939987d5f091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-07-18 10:48:13
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【推荐1】若
的内角A、B、C所对的边a、b、c满足
,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() | C.3 | D.1 |
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【推荐2】某渔轮在航行中不幸遇险,发出呼叫信号,我海军舰艇在A处获悉后,立即测出该渔轮在方位角为45°距离为10海里的C处,并测得渔轮正沿方位角为105°的方向,以9海里/小时的速度向小岛靠拢,我海军舰艇立即以21海里/小时的速度前去营救,则舰艇靠近渔轮所需的时间为( )小时.
A.![]() | B.![]() | C.![]() | D.1 |
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【推荐1】在底面为正方形的四棱锥
中,
底面
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![](https://img.xkw.com/dksih/QBM/2021/1/30/2647331479363584/2650711997382656/STEM/199bc5a8e423473dbbece64f0eeae15a.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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【推荐2】在我国古代数学名著《九章算术·商功》中刘徽注解“邪解立方得二堑堵”.如图,在正方体
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