解题方法
1 . 如图,在四棱锥
中,四边形
为菱形,
,
.
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681351395368960/2687126835879936/STEM/f57b969b714f4676958752b1d344ac14.png?resizew=194)
(1)证明:
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f698605a196cf83ccba6a601d0e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681351395368960/2687126835879936/STEM/f57b969b714f4676958752b1d344ac14.png?resizew=194)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5a9a04de2ddcec2b2799ab5476f2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次
解题方法
2 . 如图,D是以AB为直径的半圆O上异于A,B的点,△ABC所在的平面垂直于半圆O所在的平面,且
AB=2BC=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/465f69e3-4ec9-4e79-91aa-bfaf224561b2.png?resizew=153)
(1)证明:AD⊥DC;
(2)若
求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83c9ee23ab1974908dbcb6c1f8f0d52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/465f69e3-4ec9-4e79-91aa-bfaf224561b2.png?resizew=153)
(1)证明:AD⊥DC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1b620fb692cb5feea1ae55a24d6608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
您最近一年使用:0次
2021-02-07更新
|
163次组卷
|
2卷引用:贵州省毕节市2021届高三上学期诊断性考试数学(文)试题(一)
解题方法
3 . 菱形
的对角线
与
交于点E,
,将
沿
折到
的位置,使得
,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ab9be059-6b05-4362-9a19-5e0071709808.png?resizew=194)
(1)证明:
.
(2)求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9150043b5ee27a06714b4d3f9bdf7005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ab9be059-6b05-4362-9a19-5e0071709808.png?resizew=194)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
4 . 如图,在三棱锥
中,
平面ABC,且
,
.
证明:
为直角三角形;
设A在平面PBC内的射影为D,求四面体ABCD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3910616e36cfc1292da79e709816fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50b5c7b9aa915f9613c27ac38133062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bad03295db27144b7283e65eaa9554.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/53482b7e-f60b-4925-a354-d2eb8618790a.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f409b28f7cb97726646e79709ad25190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
您最近一年使用:0次
2018-12-31更新
|
469次组卷
|
6卷引用:贵州省镇远县文德民族中学校2020-2021学年高二3月月考数学(文)试题