解题方法
1 . 如图,在三棱锥
中,
平面
,点
分别是
和
的中点,已知
,直线
与平面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/349452a3-7825-4485-9588-5f6858bb0f80.png?resizew=187)
(1)求证:平面
平面
:
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6deecf9ccb7b7879455050633219e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ffbc423070f5d7ce2c72229066ee1cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d553f8d549f8ff2e9abca41cc1741c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/349452a3-7825-4485-9588-5f6858bb0f80.png?resizew=187)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c54a3c4557148887b49591696a831e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e9ac46aabe38e5ea1a8cb0febc98af.png)
您最近一年使用:0次
2022-08-18更新
|
685次组卷
|
2卷引用:重庆市2021-2022学年高一下学期学业质量调研数学试题
2 . 已知抛物线
的焦点为F,过点F的直线l交抛物线C于M,N两点,交y轴于P点,点N位于点M和点P之间.
(1)若
,求直线l的斜率;
(2)若
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ece74a1c672383a4d03363f376d060f8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0b05f17a40e21dfc915a7e9debfa61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
您最近一年使用:0次
解题方法
3 . 如图所示,在四棱锥
中,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/d3b09640-c5ff-4e08-8f27-e552451ebf97.png?resizew=171)
(1)证明:
;
(2)若四棱锥
的体积为4,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01eb0397a65f3a2a928b7ea77ce3e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/d3b09640-c5ff-4e08-8f27-e552451ebf97.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104a1941e557a85fd1496bc2b9be297.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次