解题方法
1 . 如图,在平行六面体
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/86de3ee0-071b-4c8e-b591-625fa67ee6b3.png?resizew=167)
(1)求
的长;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6539b62084f39afabcd9b93c2c562b7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/86de3ee0-071b-4c8e-b591-625fa67ee6b3.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa142bb96af98b846997e681609739f.png)
您最近一年使用:0次
2 . 如图,四面体OABC各棱的棱长都是1,D,E分别是OC,AB的中点,记
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/798d556e-3600-4ccb-ab4c-98717a72cb8a.png?resizew=174)
(1)用向量
表示向量
;
(2)求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe136ff8396ff6f80de6e616f290717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cae49aecae12a1aaaa29cb194a11bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebca14060caa173dd7c922c560689064.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/798d556e-3600-4ccb-ab4c-98717a72cb8a.png?resizew=174)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3aab05482046ebd5b2487850d05273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87833bb7b9bff8407e7ae4cfef9a9d15.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
您最近一年使用:0次
2021-11-18更新
|
393次组卷
|
3卷引用:山西省太原市2021-2022学年高二上学期期中质量监测数学试题