解题方法
1 . 如图,在长方体
中,
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787445061902336/2795482422845440/STEM/f44e8ea3614743438f04b9a4fcb2eb77.png?resizew=118)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787445061902336/2795482422845440/STEM/f44e8ea3614743438f04b9a4fcb2eb77.png?resizew=118)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37707eee5805c05fa2ec2884d614944b.png)
您最近一年使用:0次
2021-08-28更新
|
181次组卷
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3卷引用:贵州省贵阳市五校(贵州省实验中学、贵阳二中、贵阳八中、贵阳九中、贵阳民中)2022届高三联合考试(一)数学(文)试题
贵州省贵阳市五校(贵州省实验中学、贵阳二中、贵阳八中、贵阳九中、贵阳民中)2022届高三联合考试(一)数学(文)试题(已下线)专题19 立体几何(解答题)-备战2022年高考数学(文)母题题源解密(全国甲卷)陕西省渭南市白水县2021-2022学年高一上学期期末数学试题
名校
解题方法
2 . 如图,在长方体
中,底面
是边长为1的正方形,且
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/abb74def-cbd3-4f72-b972-86fee4120a12.png?resizew=146)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/abb74def-cbd3-4f72-b972-86fee4120a12.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea30f82d0facef330183e01855f83b20.png)
您最近一年使用:0次
2021-08-27更新
|
241次组卷
|
2卷引用:贵州省贵阳市2021届高三8月摸底考试数学(文)试题
解题方法
3 . 长方体
中,
,
,
是上底面内的一点,经过点
在上底面内的一条直线
满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/eba592b9-6a0b-4672-8935-50556b4ca007.png?resizew=152)
(1)作出直线
,说明作法(不必说明理由);
(2)当
是
中点时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0c1611f2dc5ce8349b485bf6bf66ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/eba592b9-6a0b-4672-8935-50556b4ca007.png?resizew=152)
(1)作出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa10a579055042cd2a163e7fe80e934c.png)
您最近一年使用:0次