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
|
462次组卷
|
2卷引用:黑龙江省哈尔滨市哈师大附中2024届高三上学期期中数学试题
解题方法
2 . 瀑布(图1)是埃舍尔为人所知的作品.画面两座高塔各有一个几何体,左塔上方是著名的“三立方体合体”(图2).在棱长为2的正方体
中建立如图3所示的空间直角坐标系(原点O为该正方体的中心,x,y,
轴均垂直该正方体的面),将该正方体分别绕着x轴,y轴,
轴旋转45°,得到三个正方体
,
(图4,5,6)结合在一起便可得到一个高度对称的“三立方体合体”(图7).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e3b361ab-bbcd-4ec1-8d7e-a51250337d2a.png?resizew=324)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/0bb32dad-7e15-4145-bd9e-7b88d7c08cd4.png?resizew=666)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/cbcb0d91-53de-4cc9-8883-d5af9ffe1571.png?resizew=486)
(1)设
,求
,
.
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ecd73870da15600dfdc2220693fd81b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750335e0a1896eb270407e86335a85a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e3b361ab-bbcd-4ec1-8d7e-a51250337d2a.png?resizew=324)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/0bb32dad-7e15-4145-bd9e-7b88d7c08cd4.png?resizew=666)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/cbcb0d91-53de-4cc9-8883-d5af9ffe1571.png?resizew=486)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb7fd30eee48d581e5d812c2e10aa11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fabf4c9a84e0b9690c7248a6f733f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750335e0a1896eb270407e86335a85a2.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c61c8e532d25d239382c40490905e7.png)
您最近一年使用:0次
名校
3 . 如图,在直三棱柱
中,
,E为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/dbb189e6-c49c-4401-8f34-3e87ff8e4e92.png?resizew=164)
(1)证明:
平面
;
(2)若
,求二面角
的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b622af0a12049cefde78d28d9a2597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/dbb189e6-c49c-4401-8f34-3e87ff8e4e92.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cc24037ff3b29f2cb81291734869d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b20ef9d660baa101c0574c46e107e0.png)
您最近一年使用:0次
2022-09-27更新
|
1053次组卷
|
7卷引用:宁夏石嘴山市第三中学2022-2023学年高三上学期中考试数学试题(理科)