已知正四面体
,E,F,G分别为棱
的中点,则异面直线
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/630754333e7043c573d0ecdb64cf1246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-05-21 21:53:09
|
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解题方法
【推荐1】在
中,内角A、B、C的对边分别为a、b、c,若
,
,则该三角形的外接圆直径为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09fe789bf07bafce0a0a6e9a7b91ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
A.14 | B.7 | C.![]() | D.![]() |
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【推荐2】点
为抛物线
上的两点,
是抛物线
的焦点,若
中点
到抛物线
的准线的距离为
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97afdeaa1d4433cffe5005446fcbbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de157bacd8d9ffa5a8a637caf4afdfdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f293b3c663389fa5dfce30e0b7b38e57.png)
A.2 | B.1 | C.![]() | D.![]() |
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【推荐1】已知三棱柱
的侧棱与底面边长都相等,
在底面
上的射影为
的中点,则异面直线
与
所成的角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】平面
过正方体ABCD—A1B1C1D1的顶点A,
,
,
,则m,n所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572899387236352/1572899393290240/STEM/135baf2fb37e450bae7f1130a8776f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb19812e9de82ccddc9d41360adce8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbddaae8c642b74d81b1954b79d43fe5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐3】如图,在正方体
中,点P在线段
上运动,则下列结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/81d25170-eb71-41d6-a534-ac8eb298ce90.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/81d25170-eb71-41d6-a534-ac8eb298ce90.png?resizew=192)
A.直线![]() ![]() |
B.三棱锥![]() |
C.异面直线AP与![]() ![]() |
D.直线![]() ![]() ![]() |
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