设平面
与平面
的夹角为
,若平面
的法向量分别为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba83980a38c5e1fe4be841bc8a51d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b1240a2254c189b6d2f2f0f7a20ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715b419937c45afca1eacdc5d38bc59e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2021高二·全国·专题练习 查看更多[2]
(已下线)1.4.2用空间向量研究距离、夹角问题(备作业)-【上好课】2021-2022学年高二数学同步备课系列(人教A版2019选择性必修第一册)(已下线)1.2.4 二面角(分层训练)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第一册)
更新时间:2021-12-01 06:42:09
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【推荐1】设直线
的方向向量
,平面α的法向量
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732a5c2afa05fbef0b56312a66c47107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f483b4d1f44f0c8ef5cf129f2545c5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e380108ba2cf04e68a5a9393d2b921c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
A.![]() | B.0 | C.5 | D.4 |
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【推荐2】给出下列命题:
①直线l的方向向量为
,直线m的方向向量为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dedfa42c16dd0aefa2928a6e41f3dba.png)
②直线l的方向向量为
,平面
的法向量为
,则
.
③平面
,
的法向量分别为
,
,则
.
④平面
经过三点
,
,
,向量
是平面
的法向量,则
.
其中真命题的个数是( )
①直线l的方向向量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc520546f7ed36f3dc300e86b5d8b8e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3857279c2f93b21c03c3c33c08053533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dedfa42c16dd0aefa2928a6e41f3dba.png)
②直线l的方向向量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df663f906a34b837d74c0940b18ed089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99212ca88f8ed54b0e9fcbfc9d552b3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e380108ba2cf04e68a5a9393d2b921c.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e86eec1a07e9547b778094ac2f3dc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777b4cabce2b79c1b0f3f740c455ab82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b303b1f07604f5303aea94df7f0518e9.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9976bb8d2b727e639df1dd47746cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f6f9d8550d619061ab0ba1105ec6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1b5e2746ca7dc60b89e43fe65a8baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a23d387abd15fdd9e61d96196e08f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5192d71829a74681e6dea7efcd368f88.png)
其中真命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
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名校
解题方法
【推荐1】已知四面体
中,
,
,
,则二面角
的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5aac0c43f94c561bacc7c9ac666f583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29cc627d76412c236aac6b29fa0fdf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若在正方体
中,点E是
的中点,则二面角
的平面角的正切值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbedea0713257b49989413bbc437fd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d5c4e526265b692f88ef12fe4ccf7a.png)
A.![]() | B.2 | C.![]() | D.![]() |
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