解题方法
1 . 如图,已知一个八面体的各条棱长均为
,四边形
为正方形,给出下列命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/07da4b28-b2fc-48c0-8c80-aea1b875e9e6.png?resizew=191)
①不平行的两条棱所在的直线所成的角是
或
;
②四边形
是正方形;
③点
到平面
的距离为
;
④平面
与平面
所成的锐二面角的余弦值为
.
其中正确的命题有( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/07da4b28-b2fc-48c0-8c80-aea1b875e9e6.png?resizew=191)
①不平行的两条棱所在的直线所成的角是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
其中正确的命题有( ).
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
2 . 在正方体
中,点
是侧面
内(不包含边界)的一个动点,且
点
在棱
上运动,则二面角
的余弦值的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9961e091f180e964a962adf6916f33c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3303d9cc35a32d03511a269d270badbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a1e78b441e7b7bdc70d589fa95fb81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/5408d692-939f-44a9-82b2-81e347cf0cc0.png?resizew=166)
您最近一年使用:0次
2020-11-14更新
|
372次组卷
|
2卷引用:北京一零一中学2020-2021学年高二上学期期中考试数学试题