名校
解题方法
1 . 在正方体
中,点
,
,
分别为棱
,
,
的中点,给出下列命题:①
;②
;③
平面
;④
和
所成角为
.则正确的命题有__________ .(请填写正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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2 . 《九章算术》是我国古代内容极为丰富的数学名著,书中有如下问题:“今有仓,广三丈,袤四丈五尺,容粟一万斛,问高几何?”其意思为:“今有一个长方体(记为
)的粮仓,宽3丈(即
丈),长4丈5尺,可装粟一万斛,问该粮仓的高是多少?”已知1斛粟的体积为2.7立方尺,一丈为10尺,则下列判断正确的是__________ .(填写所有正确结论的编号)
①该粮仓的高是2丈;
②异面直线
与
所成角的正弦值为
;
③长方体
的外接球的表面积为
平方丈.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
①该粮仓的高是2丈;
②异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dedfba8b9447a4db53baae62fdeebfd.png)
③长方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87dc66baa296f854ca5d283a958af216.png)
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2018-05-12更新
|
775次组卷
|
2卷引用:【全国市级联考】湖南省湘潭市2018届高三下学期第四次模拟考试数学(理)试题
3 . 已知正方体
中,
,
,
分别是棱
,
,
的中点,点
在对角线
上,给出以下命题:①当
在
上运动时,恒有
//面
;②当
在
上运动时,恒有
面
;③若
,则
//面
;④若过点
且与正方体的十二条棱所成的角都相等的直线有
条,过点
且与直线
和
所成的角都为
的直线有
条,则
.其中正确的命题为______ .(填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212f4416ce8fcd69b531ceda6f6ebfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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