如图,在正方体
中,E,F,G,H,M分别是棱
,
,
的中点,点N在四边形EFGH的四边及其内部运动,则当N只需满足条件________ 时,就有
;当N只需满足条件________ 时,就有MN∥平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://img.xkw.com/dksih/QBM/2011/4/2/1570101236088832/1570101241184256/STEM/cee4b48e-9b86-488e-99a9-a0be7077aed7.png?resizew=191)
2011·北京东城·一模 查看更多[2]
(已下线)2011届北京市东城区示范校高三第二学期综合练习数学理卷(已下线)专题24 立体几何中垂直的存在性问题-【重难点突破】2021-2022学年高一数学常考题专练(人教A版2019必修第二册)
更新时间:2016-11-30 17:22:03
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【推荐2】如图,正方体
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