解题方法
1 . 正四棱柱中,
,
,长为1的线段
在棱
上移动,长为3的线段
在棱
上移动,点
在棱
上移动,则四棱锥
的体积是
您最近一年使用:0次
解题方法
2 . 如图,已知
平面
,
,
是等腰直角三角形,其中
,且
.
上是否存在一点
,使
平面
?
(2)在线段
上是否存在点M,使得点B到平面
的距离等于1?如果存在,试判断点M的个数;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d1c1361c9938ed911bfaf8e9beea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2a696b84492a736c5b444e61b7ad96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f70cf3f6c7acbf60d4a4ca0ce89619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0701f67727b0fc8100cfb5e20ec27d9b.png)
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名校
解题方法
3 . 如图,四棱锥
中,底面ABCD为矩形,平面
平面ABCD,
,
,E,F分别为AD,PB的中点.求证:
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847899779072/2920000285032448/STEM/8c22064922c74549955b4ec103b2c53f.png?resizew=242)
(1)
∥平面PCD;
(2)平面
平面PCD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847899779072/2920000285032448/STEM/8c22064922c74549955b4ec103b2c53f.png?resizew=242)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
您最近一年使用:0次
2022-02-19更新
|
774次组卷
|
6卷引用:江西省永丰县永丰中学2020-2021学年高二上学期期中考试数学(理)试题
4 . 如图是一个直三棱柱(以
为底面)被一平面所截得的几何体,截面为ABC.已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56117758504321927b7ff589b68fd839.png)
.
为AB的中点,证明:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56117758504321927b7ff589b68fd839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fdf988c4d34669aa166a3450e64ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa97d10469561da72b858293da6933c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a11228485e2af3df6f23d0a613f1e30.png)
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5 . 在四面体ABCD中,过棱AB的上一点E作平行于AD,BC的平面分别交四面体的棱BD,DC,CA于点F,G,H
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0eac358e-d7aa-4e75-b4fd-cbe363f87349.png?resizew=152)
(1)求证:截面EFGH为平行四边形
(2)若P、Q在线段BD、AC上,
,且P、F不重合,证明:PQ∥截面EFGH
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0eac358e-d7aa-4e75-b4fd-cbe363f87349.png?resizew=152)
(1)求证:截面EFGH为平行四边形
(2)若P、Q在线段BD、AC上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7071b5ecb076a09f8d128c58f01220ee.png)
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6 . 如图,设
为正方形
所在平面外一点,点
分别在
上,且
.证明:直线
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60ed701b319dbdf1541a17e8da003f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784bf07e745ca00fc0f8e8f4c0343b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ce5b706ae738b30640c0d44174a739.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/a68b3c38-9043-4a12-82e1-053c850503e1.png?resizew=144)
您最近一年使用:0次
2018-12-28更新
|
200次组卷
|
6卷引用:数学奥林匹克高中训练题(150)
7 . 我国古代数学名著《九章算术》中记载的“刍甍”是底面为矩形,顶部只有一条棱的五面体.如图,五面体
是一个“刍甍”,四边形
为矩形,
与
都是正三角形,
,
.
![](https://img.xkw.com/dksih/QBM/2018/12/9/2093247311503360/2093686354321408/STEM/4eec7dd95df640599946526bd828a835.png?resizew=317)
求证:
面
;
求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019c0405370c673e37b46c066eba839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c85022048334bb883119115330b45a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae027044287787834a7f69aef58deef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abcdcc84bdbd118d07b19ac61611e86.png)
![](https://img.xkw.com/dksih/QBM/2018/12/9/2093247311503360/2093686354321408/STEM/4eec7dd95df640599946526bd828a835.png?resizew=317)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab1cf5f4e0b36edf3b9a064dc75828b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073a88b42836fb88433679932b48ad03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09446528b12dd384c6828e1ef1c70e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6d456e2adab93eabc931b3227bb79f.png)
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2018-12-10更新
|
358次组卷
|
3卷引用:【校级联考】安徽省示范高中培优联盟2018-2019学年高二上学期冬季联赛数学(理)试题
8 . 如图所示的几何体中,
垂直于梯形
所在的平面,
为
的中点,
,四边形
为矩形,线段
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/09dbbc8d-1c79-4897-8778-2921326c7869.png?resizew=170)
(1)求证:
平面
;
(2)求二面角
的正弦值;
(3)在线段
上是否存在一点
,使得
与平面
所成角的大小为
?若存在,求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54c11863ae31dc12d880c44f823b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc5addb203f4b6985880c4cef3ddc14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5bf51c07144386bd23a422d9ceb140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/09dbbc8d-1c79-4897-8778-2921326c7869.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c233b95865198572282d7a66ce689e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
您最近一年使用:0次
2019-06-05更新
|
4463次组卷
|
11卷引用:2015年全国高中数学联赛黑龙江赛区预赛试题
2015年全国高中数学联赛黑龙江赛区预赛试题2015届北京市昌平区高三上学期期末质量抽测理科数学试卷天津市新华中学2019届高三高考模拟数学(理)试题浙江省宁波市慈溪市三山高级中学等六校2019-2020学年高二上学期期中数学试题浙江省宁波市六校联考2019-2020学年上学期高二期中数学试题江苏省苏州市陆慕高级中学2019-2020学年高二下学期在线学习质量检测数学试题(已下线)数学-2020年高考数学押题预测卷03(江苏卷)《2020年高考押题预测卷》人教A版(2019) 选择性必修第一册 过关斩将 第一章 空间向量与立体几何 专题强化练3 立体几何中的存在性与探究性问题(已下线)专题03 空间向量与立体几何-立体几何中的存在性与探究性问题-2021-2022学年高二数学同步练习和分类专题教案(人教A版2019选择性必修第一册)福建省建瓯市芝华中学2021-2022学年高二上学期第一次阶段性检测数学试题安徽省蚌埠市五河致远实验学校、固镇县汉兴学校2023-2024学年高二上学期10月联考数学试题
解题方法
9 . 如图,在直三棱柱
中,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/a3acc036-e01d-48a6-8ef3-1a66c959410a.jpg?resizew=126)
(1)证明:
平面
;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/a3acc036-e01d-48a6-8ef3-1a66c959410a.jpg?resizew=126)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d85c8d87197c9ffad619eb3912e1b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6610370a5aefaf45fdb579521484e3b5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e937690538483bca282ff6831772b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bdeec91171e6d0c5247f199ffd7c63.png)
您最近一年使用:0次
2018-03-26更新
|
803次组卷
|
4卷引用:2017届河南豫北名校联盟高三文上精英对抗赛数学试卷2