名校
解题方法
1 . 如图,在棱长为1的正方体
中,M为BC的中点,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/db22f1f1-98a0-4b8a-bad8-8c5b7f6f53e5.png?resizew=175)
A.AM与![]() ![]() |
B.![]() ![]() ![]() |
C.过点A,M,![]() ![]() ![]() |
D.四面体![]() ![]() |
您最近一年使用:0次
2022-11-15更新
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447次组卷
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4卷引用:湖北省恩施州高中教育联盟2021-2022学年高二下学期期中数学试题
名校
2 . 如图,点
在
内,
是三棱锥
的高,且
.
是边长为
的正三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/b8d41381-a60e-45ff-900a-9d0b0ebf9d84.png?resizew=256)
(1)求点
到平面
的距离;
(2)点
是棱
上的一点(不含端点),求平面
与平面
夹角余弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d350d6a53f0de46567e2bd5cd5147a85.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/b8d41381-a60e-45ff-900a-9d0b0ebf9d84.png?resizew=256)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96bc9a285172c48e4726ee6492670ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
2022-10-29更新
|
655次组卷
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7卷引用:湖北省恩施州高中教育联盟2022-2023学年高二上学期期中联考数学试题