1 . 图1是矩形
,
,
,M为
的中点,将
沿
翻折,得到四棱锥
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8bb90e9e-faf7-45a2-b234-c9dbf97df248.png?resizew=331)
(Ⅰ)若点N为
的中点,求证:
平面
;
(Ⅱ)若
.求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21158c6a4bb5d42e75fef98bf72ca27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8bb90e9e-faf7-45a2-b234-c9dbf97df248.png?resizew=331)
(Ⅰ)若点N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d447ce2833cac5260ed5532283fa3997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df915a088300b53c298fecd10675e5b.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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2020-05-15更新
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4卷引用:河南省安阳市文峰区第一中学2021-2022学年高一下学期数学(文)期末考试试题