名校
解题方法
1 . 如图,在四棱锥
中,
底面
,底面
是边长为2的正方形,
,
,
分别是
,
的中点.
(1)求证:
平面
;
(2)求二面角
的大小;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6a1ca4a766321444fcafaef74457e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/34183bde-8e0c-46cf-9408-c7137ccc7bd7.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36148e5b0d89ba45bd98b91da00bf2b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
2023-08-04更新
|
1119次组卷
|
3卷引用:内蒙古乌兰察布市集宁区第二中学2022届高三三模理科数学试题
解题方法
2 . 正方体
中,E,F分别是
的中点,则直线
与EF所成角的余弦值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3defdd4d0c665d55184b84a7eb316f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca4e998302db993c29acf45d7295934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 如图,四棱锥
中,侧面
底面ABCD,
,
,
,
,E,F分别是SC和AB的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
平面SAD;
(2)点P在棱SA上,当
与底面
所成角为
时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d1553f6806c1eee3b17b94d23f0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03766e254c3185d20f5f6d93fa6950d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3165e97ffc02c3d21a79f4e9f34ff368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42bcbc8c13e55d56ca7c483a778e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0cedfb76e95ae3371fad58069554ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)点P在棱SA上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abff725851bf24e35a4818af2e85c5c5.png)
您最近一年使用:0次
2023-04-21更新
|
824次组卷
|
3卷引用:内蒙古自治区乌兰察布市2023届高三二模理科数学试题
解题方法
4 . 四棱锥P﹣ABCD中,PD=DA=AB=
CD,AB∥CD,∠ADC=90°,PD⊥平面ABCD,M为PC中点,平面ADM交PB于Q,则CQ与PA所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
5 . 三棱台ABC﹣A1B1C1中,AA1⊥平面ABC,∠BAC=90°,AB=
AA1=2A1B1=2A1C1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d5a238c8-fc17-4c18-9ab0-730a564fda6e.png?resizew=135)
(1)证明:AB1⊥BC1;
(2)求AC1与平面A1C1B所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d5a238c8-fc17-4c18-9ab0-730a564fda6e.png?resizew=135)
(1)证明:AB1⊥BC1;
(2)求AC1与平面A1C1B所成角的正弦值.
您最近一年使用:0次
2021-05-14更新
|
541次组卷
|
2卷引用:内蒙古乌兰察布2021届高三一模 数学(文科)试题