名校
解题方法
1 . 如图, 三棱柱
,
为
的中点,
, 设 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70a770a19426344b467aec892a0aad5.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853138531450880/2899033356271616/STEM/21db5ed7daaf4efc87507f0af5c9a0b7.png?resizew=180)
(1)试用
表示向量
;
(2)若
,异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b50d74a22d0c8951015a16ed00f9ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70a770a19426344b467aec892a0aad5.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853138531450880/2899033356271616/STEM/21db5ed7daaf4efc87507f0af5c9a0b7.png?resizew=180)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7cad34fccd0fe584087604e863f352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2173a791f504749b01c97b951be4b940.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d505741221e911dce3adf4ffa9a17a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
您最近一年使用:0次
2022-01-21更新
|
485次组卷
|
5卷引用:湖北省随州市曾都区第一中学2022-2023学年高二上学期开学测试数学试题
名校
解题方法
2 . 已知正三棱柱
的所有棱长都为
,则
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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-01-06更新
|
415次组卷
|
3卷引用:湖北省随州市曾都区第一中学2022-2023学年高二上学期开学测试数学试题