1 . 如图,三棱柱
中,
底面ABC,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/29192cc9-3881-48cd-954d-70059ba8e743.png?resizew=185)
(1)求直线
与平面ABC所成角的大小;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd8f940b796af67206b3f9dd410a407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/29192cc9-3881-48cd-954d-70059ba8e743.png?resizew=185)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7d857811cbd619f868d951aa7a0ab8.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
您最近一年使用:0次
2022-04-11更新
|
1390次组卷
|
2卷引用:贵州省2021-2022学年高二7月学业水平考试数学试题
解题方法
2 . 如图,直三棱柱
中,
,M为棱
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/bf03872a-1f5a-4bb9-baa1-e64bfc2cded0.png?resizew=151)
(1)求三棱锥
的体积;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3fcd16870df59c129f249c77cae646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/bf03872a-1f5a-4bb9-baa1-e64bfc2cded0.png?resizew=151)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3531142aafad00b62ad123b2646373e6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d428b5b35a66bc647ef7f802cf336d.png)
您最近一年使用:0次
2022-07-16更新
|
734次组卷
|
2卷引用:贵州省2021-2022学年高二下学期7月高中学业水平考试数学试题