名校
1 . 如图,四棱锥
的底面是矩形,
,
,M为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/32381c57-0d50-4580-9d41-43705c2f71e1.png?resizew=152)
(1)证明:
底面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0efbdc4cbc82cc55bed9905f81fbfc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fa64045f67d555833032b531695929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/32381c57-0d50-4580-9d41-43705c2f71e1.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bec03e804f0cea1db5cde2aa185056a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d98ad030dcb6671c64a24e96d916c8.png)
您最近一年使用:0次
2023-11-30更新
|
464次组卷
|
2卷引用:四川省绵阳市江油中学2023-2024学年高二上学期期末数学模拟试题3
2 . 图1是由正方形
组成的一个等腰梯形,其中
,将
、
分别沿
折起使得E与F重合,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/96241205-5ee2-45fe-a504-beb19971deba.png?resizew=315)
(1)设平面
平面
,证明:
;
(2)若二面角
的余弦值为
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f0391c01548b0b5968f5b72cdd203a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/96241205-5ee2-45fe-a504-beb19971deba.png?resizew=315)
(1)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0832e094d5c05ec13c38ae556b3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c0566d4ccf791d639c7823398941d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56adc934c9ad3cb261c5cbdc346b9631.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445b51117626fbd3373e32acc514c64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
2021-04-16更新
|
1064次组卷
|
7卷引用:四川省泸县第四中学2022-2023学年高二上学期期末考试数学(理)试题