1 . 如图,正三棱柱
的棱长均为2,M是侧棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119770124288/2646380397133824/STEM/0766a3e036e8467893520be4d4760d26.png?resizew=199)
(1)在图中作出平面
与平面
的交线l(简要说明),并证明
平面
;
(2)求平面
与平面
所成二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119770124288/2646380397133824/STEM/0766a3e036e8467893520be4d4760d26.png?resizew=199)
(1)在图中作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed2f706801662432b68797e72647c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8b5a6dbcf05f572f83f51abf7d668c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed2f706801662432b68797e72647c6e.png)
您最近一年使用:0次
2021-01-29更新
|
977次组卷
|
2卷引用:贵州省贵阳市2021届高三上学期期末检测考试数学(理)试题
2 . 已知在四棱锥
中,底面
是矩形,
平面
,
,
分别是
,
的中点,
与平面
所成的角的正切值是
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/3429eb66-6422-4c62-a2d4-8e4c7cf17ecd.png?resizew=218)
(1)求证:
平面
;
(2)求二面角
的正切值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8716b5aad93d97ca1c3791b9c717cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/3429eb66-6422-4c62-a2d4-8e4c7cf17ecd.png?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d46554105150391e671609fc6348a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15fdf93ad368287ede49777923d190dc.png)
您最近一年使用:0次
2019-09-18更新
|
461次组卷
|
2卷引用:贵州省安顺市平坝区平坝第一高级中学2018-2019学年高一下学期期末数学试题