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1 . 已知正方体
的棱长为2,
为体对角线
上的一点,且
,现有以下判断:①
;②若
平面
,则
;③
周长的最小值是
;④若
为钝角三角形,则
的取值范围为
,其中正确判断的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd250fb1bebe4f610c7fe281217b38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c040eb3985b66e8db65932fdb63f844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4645450a006f2c20087486d0833afbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1c3ea872a20fdc1843cb5ffce8a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b590aaed2d5ef2610aa608faf95c02ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fcec77177443519207ffc6afb988d0.png)
您最近一年使用:0次
2019-12-10更新
|
569次组卷
|
3卷引用:重庆市渝中区巴蜀中学2019-2020学年高三“一诊”模拟测试卷数学(理)试题
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2 . 在正方体ABCD﹣A1B1C1D1中,点E、F、G分别为棱A1D1、A1A、A1B1的中点,给出下列四个命题:①EF⊥B1C;②BC1∥平面EFG;③A1C⊥平面EFG;④异面直线FG、B1C所成角的大小为
.其中正确命题的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
A.①② | B.②③ | C.①②③ | D.①②④ |
您最近一年使用:0次