如图,正方体
的棱长为
,过点
作平面
的垂线,垂足为点
.有下列四个命题
![](https://img.xkw.com/dksih/QBM/2018/2/5/1875811655548928/1877114544095232/STEM/6efaac7694bc47edb8592b6274607e94.png?resizew=199)
⑴点
是
的垂心 ⑵
平面
⑶二面角
的正切值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
⑷点
到平面
的距离为
则正确的命题有________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2018/2/5/1875811655548928/1877114544095232/STEM/6efaac7694bc47edb8592b6274607e94.png?resizew=199)
⑴点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83639461efb94a72bd1d0d8c190e29b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62932e03d3081539626dced0530ad1ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86eec8526479272d15bb3b171a46de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52bd8b014ebd8b1cc34b66912b0b9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
⑷点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
17-18高二·四川乐山·期中 查看更多[4]
四川省乐山四校2017-2018学年高二第三学期半期联考数学(文科)试题(已下线)《2018届优生-百日闯关系列》数学专题 二 第四关 以立体几何为背景的新颖问题为背景的填空题河北省武邑中学2018-2019学年高二上学期期中数学(文)试题2007年普通高等学校招生考试数学(文)试题(江西卷)
更新时间:2018-02-07 11:42:13
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【推荐1】如图,平行六面体
中,底面ABCD和侧面BCC1B1都是矩形,E是CD的中点,D1E⊥CD,AB=2BC=2,且平面BCC1B1与平面D1EB的夹角的余弦值为
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【推荐2】
是
所在平面外一点,过
作
平面
,垂足是
,连接
、
、
.
(1)若
,则
为
的__________ 心;
(2)
,
,
,则
是
的__________ 心.
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(1)若
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(2)
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【推荐3】正四棱锥S-ABCD的侧棱长为
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【推荐1】在长方体
中,
,
,点
在底面
上.
(1)若点
与点
重合,则点
到平面
的距离是__________ .
(2)若点
到直线
和
的距离相等,则
的最小值是__________ .
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(2)若点
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【推荐2】正方体ABCD-A1B1C1D1的棱长为1,E,F分别为BB1,CD的中点,则点F到平面A1D1E的距离为________ .
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【推荐1】如图,在直三棱柱
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【推荐1】
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分别是
的中点,则下列结论中正确的是________ (填写正确结论的序号).
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【推荐2】如图,四棱锥
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【推荐3】若α,β是两个平面,m,n是两条线,则下列命题不正确的是___________
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②如果
,
,那么
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③如果
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①如果
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④如果
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