如图,已知四棱锥
的各棱长均为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ce289c7cd2c004a200cfe5372d36b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ce289c7cd2c004a200cfe5372d36b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/72ade644-7e80-4d1e-8309-8615f7fd3f35.png?resizew=183)
更新时间:2023-10-14 08:16:22
|
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填空题-单空题
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较易
(0.85)
解题方法
【推荐1】如图,三棱柱
的所有棱长均相等,
,
分别为
的中点,则异面直线
与
所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808d8f02b3ac00d2bad831834dcb5fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac132dccb095f424e33e803e891681a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/6f2a2001-59f2-47d9-adca-785882ab0a65.png?resizew=182)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
解题方法
【推荐2】若
,若
不共面,当
时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668b7f96888281bb83fe5c96411fc0cf.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66aba2467b1cb104c58e093028a2bd6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb4f795474089c4ca5183f0b8c8210d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccb81d9a32e0e24e4841c1bb9ffd80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668b7f96888281bb83fe5c96411fc0cf.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
解题方法
【推荐1】如图,三棱柱
的所有棱长均相等,
,
分别为
的中点,则异面直线
与
所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808d8f02b3ac00d2bad831834dcb5fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac132dccb095f424e33e803e891681a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/6f2a2001-59f2-47d9-adca-785882ab0a65.png?resizew=182)
您最近一年使用:0次