1 . 如图,长方体
中,
,
,点E是线段AB中点.
证明:
;
求二面角
的大小的余弦值;
求A点到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95db5d71f0d7cdb83e2b6bb25cea42b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62191bcb4f06ed7667c470207a91cf8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dbeb4e8eeb288b3cabb5c30b6af473b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557b79c2a9bc8321629c1d1c8bcf74c2.png)
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120854487957504/2123462368133120/STEM/d75b15a0cba84c2b984465ee7f16dbb7.png?resizew=199)
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2016-12-03更新
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2卷引用:2014-2015学年广东省揭阳市三中高二下学期第一次段考理科数学试卷