如图,在三棱锥
中,
,
,
,
平面
,
为
的中点,则直线
与
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/813ad1b3-b4c1-447f-9af7-e7622f8bba71.png?resizew=158)
更新时间:2023-07-18 22:30:53
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐1】若满足
,
的△ABC恰有一解,则实数m的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84be9bbd568698810c720f0b15ab92c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0c26071fa1ebab92b8e750fd50d828.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐2】已知
的内角A,B,C的对边分别为a,b,c,
为边
的中点,
,
,
,则边a的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5659734bb483b3c664278f488d5867c6.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】如图,三棱锥P- ABC中,PA⊥底面ABC,底面ABC是边长为2的正三角形,且
,若M是BC的中点,则异面直线PM与AC所成角的大小是__________ (结果用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967f74b8993c61634ceed95edca05ffd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/320ea6ce-9bfb-416b-b032-7f0e8ec68cb5.png?resizew=122)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】如图,正方形
的边长为
,已知
,将
沿BE边折起,折起后A点在平面
上的射影为D点,则翻折后的几何体中有如下描述:其中正确的有______
①AB与DE所成角的正弦值是
;②AB
CE;③
的体积是
;
④平面
平面
;⑤二面角
的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2125dfe51596f77b060572f706cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/50992be3-b123-495f-b1a3-25b534fa15d9.png?resizew=311)
①AB与DE所成角的正弦值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db5169270ae5637c510cf7675c0758a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aec67c4c83e4955f36ec34afb19df83.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445b51117626fbd3373e32acc514c64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐1】已知三条相交于点
的线段
,
,
两两垂直,
在平面
外,
平面
于
,则垂足
是三角形
的__ 心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17622ea6f6f5afd1ad817a557e5889d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】在棱长为1的正方体
中,M是棱
的中点,点P在侧面
内,若
,则
的面积的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7ddbb49c644bf06ccbad885ba2c84a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17230625e72d3a9c6d72ff61019ff61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fc4fbd9390e2a5200920910abc63b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36de1f9a3e7abca8eff921b12c4077c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e68c3b4e4aff8c6b7f8b6189e3985f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/42148d61-f0b3-4244-9c57-d6b56513fd55.png?resizew=154)
您最近一年使用:0次