已知等边三角形
的边长为
,
分别为
的中点,将
沿
折起至
,在四棱锥
中,下列说法正确的序号是___________ .
①直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e762b6254e43bab7ca4a34201845d0.png)
②当四棱锥
体积最大时,二面角
为直二面角
③在折起过程中存在某位置使
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c5d45898d3bfd7cad3ea3830d06f5f.png)
④当四棱
体积最大时,它的各顶点都在球
的球面上,则球
的表面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e7040c2fd8a163d71e35805775feb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25c1f004fbf481518e0c14bf1bda6b3.png)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e762b6254e43bab7ca4a34201845d0.png)
②当四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25c1f004fbf481518e0c14bf1bda6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4085d6be6b34d6266e16164c60bbe50b.png)
③在折起过程中存在某位置使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6da9f598fecf6fcf41cd65b45cbe08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c5d45898d3bfd7cad3ea3830d06f5f.png)
④当四棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25c1f004fbf481518e0c14bf1bda6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a628810c9dc52aa96f3eb68c34361be1.png)
20-21高一下·黑龙江鹤岗·期末 查看更多[2]
更新时间:2021-07-24 15:10:32
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【推荐1】过长方体的一个顶点的三条棱长分别是1、2、
,且它的八个顶点都在同一球面上,则这个球的表面积是__________ .
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【推荐2】四面体
中,有一条棱长为
,其余五条棱长均为1,则其外接球的表面积为___________ .
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【推荐1】如图所示,在正四棱柱ABCD-A1B1C1D1中,E,F,G,H分别是CC1,C1D1,D1D,DC的中点,N是BC的中点,点M在四边形EFGH上或其内部运动,且使MN⊥AC.
![](https://img.xkw.com/dksih/QBM/2014/3/27/1571581743513600/1571581748961280/STEM/75ec8c39-5a20-40f3-92aa-af6584e18e3d.png)
对于下列命题:①点M可以与点H重合;②点M可以与点F重合;③点M可以在线段FH上;④点M可以与点E重合.其中真命题的序号是________ (把真命题的序号都填上).
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对于下列命题:①点M可以与点H重合;②点M可以与点F重合;③点M可以在线段FH上;④点M可以与点E重合.其中真命题的序号是
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【推荐2】如图,在单位正方体
中,点P是线段
上的动点,给出以下四个命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/d0c52d24-34c5-4191-9a90-fb7936284956.png?resizew=186)
①直线
与直线
所成角的大小为定值;
②二面角
的大小为定值;
③若Q是对角线
,上一点,则
长度的最小值为
;
④若R是线段BD上一动点,则直线PR与直线
有可能平行.
其中真命题有______ (填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/d0c52d24-34c5-4191-9a90-fb7936284956.png?resizew=186)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad3a1ea6790177130e16c2124984087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
②二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d286cc307396ae72d71f98503b942f7e.png)
③若Q是对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7daf1bd6cc2e6229afc02131d714f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
④若R是线段BD上一动点,则直线PR与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
其中真命题有
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【推荐3】如图,在正方体ABCD﹣A1B1C1D1中,点P在线段B1C上运动,则正确结论是________ .
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828628154507264/2834745262407680/STEM/d8c37d59-d3cf-47de-81a3-39b9880037d5.png?resizew=256)
①直线BD1⊥平面A1C1D
②直线AP∥平面A1C1D
③三棱锥P﹣A1C1D的体积为定值
④异面直线AP与A1D所成角的取值范围是[
,
]
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①直线BD1⊥平面A1C1D
②直线AP∥平面A1C1D
③三棱锥P﹣A1C1D的体积为定值
④异面直线AP与A1D所成角的取值范围是[
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【推荐1】
是⊙O的直径,点
是⊙O上的动点(点
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重合),过动点
的直线
垂直于⊙O所在的平面,
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).
(1)
;(2)
;(3)
;(4)
.
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(1)
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【推荐2】如图,正方体
的棱长为1,E,F分别为棱
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/db18459c-5e2a-463f-94b7-6fc1a7997126.png?resizew=165)
①
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
②在平面
内总存在与平面
平行的直线
③
在侧面
上的正投影是面积为定值的三角形
④当E,F为中点时,平面
截该正方体所得的截面图形是五边形
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①
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
②在平面
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③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f45fae2d284b17d1acaf70efa13d1.png)
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【推荐1】设m、n是两条不同的直线,
、
是两个不同的平面,给出下列四个命题.
①若
,则
∥
;
②若
,
,
,则
或
;
③若
,
,则
∥
;
④若
,则
.
其中正确命题的序号是___________________________ (把所有正确命题的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303d8306e522b0fca02d0f1211bb11a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c166c4d75211e5294eb440bf2a6350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39344e476725f3fbae35f2e73377a38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59b1a01a6da42ff2a41e5b91ea301ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53cd751c44ad4d9ebd8e3243e751321.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d81ac830af0375b85940e3933a1a266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
其中正确命题的序号是
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【推荐2】如图所示,点
在正方体
的面对角线
上运动,则下列四个结论:
①三棱锥
的体积不变;②
面
;③面
面
.
其中正确结论的序号是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c4ad6c77a6459a37bc398ecd5e5253.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6e80ce4ad0fac5743ed80f048d77a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de70dbffc7d55126e47be65632b459a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577dc0ad1abc21a66c22d0791f382f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455d7e31a8dc49803db8ecf60ae59354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577dc0ad1abc21a66c22d0791f382f31.png)
其中正确结论的序号是
![](https://img.xkw.com/dksih/QBM/2018/1/1/2084571035803648/null/STEM/6a035c0140cd4abe8f85eb377d76214f.png?resizew=135)
您最近一年使用:0次