在空间四边形
中,
分别是
上的点,且
,则
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680b5ad81bb4c8324c76e0d3fd728ec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b971ff1b6f62b36cf0b9a641fc419458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eea0449f070562df658a7e43e1e1516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-23 09:27:54
|
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解题方法
【推荐1】
中,
的垂直平分线交
于点
,
,
,
,则
的面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/5f1f6727-bd3e-49ad-8170-864dfc94de7e.png?resizew=225)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61f73bddbe5fd6f435351a6f026a90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/5f1f6727-bd3e-49ad-8170-864dfc94de7e.png?resizew=225)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】若△ABC的内角A,B,C满足
,则cosB=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e37f730930a7808cafc8b0659283f2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】如图是正方体的平面展开图,则在这个正方体中:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/a821fc3e-89b4-4a30-a5a1-6d91849f2762.png?resizew=177)
①
与
平行 ②
与
是异面直线
③
与
成
角 ④
与
是异面直线
以上四个命题中,正确命题的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/a821fc3e-89b4-4a30-a5a1-6d91849f2762.png?resizew=177)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
以上四个命题中,正确命题的序号是( )
A.①② | B.①④ |
C.②③ | D.③④ |
您最近一年使用:0次
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|
适中
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名校
解题方法
【推荐2】已知正四面体ABCD,设异面直线AB与CD所成的角为
,侧棱AB与底面BCD所成的角为
,侧面ABC与底面BCD所成的锐二面角为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次