在棱长为2的正方体
中,若点P是棱上一点(含顶点),则满足
的点P的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5037fd1025e3dce45376716677858c6.png)
A.8 | B.12 | C.18 | D.24 |
更新时间:2024-05-07 13:29:23
|
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【推荐1】如图:
的二面角的棱上有
两点,直线
分别在这个二面角的两个半平面内,且都垂直于
. 已知
则
的长为( )
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876356825382912/1879206062219264/STEM/64a66317c1d74ff3af38a3334f52b20b.png?resizew=227)
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A.![]() | B.6 | C.![]() | D.8 |
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【推荐2】给出下列命题,其中正确的命题是( )
A.若向量![]() ![]() ![]() |
B.已知![]() ![]() ![]() ![]() ![]() ![]() |
C.![]() |
D.已知向量![]() ![]() ![]() ![]() ![]() |
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解题方法
【推荐1】正方体
棱长为2,
是棱
的中点,
是四边形
内一点(包含边界),且
,当三棱锥
的体积最大时,
与平面
所成角的正弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知空间向量
,向量
,且
,则
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【推荐1】在三棱锥
中,
平面
,
为正三角形,
,
,点
在线段
上,且
,当
时,
( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,平面
平面
是等边三角形,四边形
是矩形,且
,E是
的中点,F是
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时,
( )
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