如图,在正方体
中,
在线段
上运动,则下列结论中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b3dc05a2-c3e9-413a-8ede-2cc2809f75e4.png?resizew=186)
(1)三棱锥
的体积为定值;(2)
;(3)
与
所成的角的范围为
;(4)存在点
,使
与平面
成的角为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b3dc05a2-c3e9-413a-8ede-2cc2809f75e4.png?resizew=186)
(1)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8049311621004b8d0f2637d13010db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c5488aa7e85e0b113f6d25aee61377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a52298e06894173520ca36a565bef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
A.1 | B.2 | C.3 | D.4 |
20-21高二上·四川内江·阶段练习 查看更多[3]
四川省内江市资中县第二中学2020-2021学年高二上11月月考理科试题(已下线)第33练 空间角与距离-2021年高考数学(理)一轮复习小题必刷湖南省岳阳市华容县2021-2022学年高一下学期期末数学试题
更新时间:2020-11-23 09:19:19
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【推荐1】过正方形
的顶点
作直线
,使得
与直线
,
所成的角均为
,则这样的直线
的条数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图是三棱锥
的三视图,点
在三个视图中都是所在边的中点,则异面直线
和
所成角的余弦值等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/d030100c-e31f-4005-9671-281a5d85cd8c.png?resizew=233)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知
表示一条直线,
,
表示两个不重合的平面,有以下三个语句:①
;②
;③
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图正方体ABCD-A1B1C1D1的棱长为a,以下结论错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/4ea2a167-e711-43ba-8c52-7a06e9be4db9.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/4ea2a167-e711-43ba-8c52-7a06e9be4db9.png?resizew=170)
A.异面直线A1D与AB1所成的角为60° | B.直线A1D与BC1垂直 |
C.直线A1D与BD1平行 | D.三棱锥A-A1CD的体积为![]() |
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【推荐1】在大小为
的二面角
中,
,
且
.记直线AB与直线l的夹角为
,直线AB与半平面β的夹角为
,则“
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”的( )
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A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
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【推荐2】已知平面
,直线
,记
与
所成的角分别为
,若
,则( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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