名校
解题方法
1 . 如图,桌面上摆放了两个相同的正四面体
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/6e3a0fef-b03f-4cd7-a1ca-d42bfe860b67.png?resizew=179)
(1)求证:
;
(2)若
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6d7e887348f80fda1e157e0222573d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a009fe059af6b399cb5c49839a0511.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/6e3a0fef-b03f-4cd7-a1ca-d42bfe860b67.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56539deb1f0bfac0f566c6fc4c1b9bab.png)
您最近一年使用:0次
2022-09-11更新
|
437次组卷
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2卷引用:四川省宜宾市第四中学校2022-2023学年高二下学期开学考试数学(文)试题
2 . 已知直三棱柱
中,D为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961617978122240/2962970583605248/STEM/5acc718cf82545d08691ff635b3ed8c1.png?resizew=147)
(1)若
,
,
,求点C到平面ABD的距离;
(2)从下面①②③中选取两个作为条件,证明另外一个成立.
①
;②
;③
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961617978122240/2962970583605248/STEM/5acc718cf82545d08691ff635b3ed8c1.png?resizew=147)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
(2)从下面①②③中选取两个作为条件,证明另外一个成立.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f35646cb29fafd1e1a214b69e4f22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd48fe75d71e5658e92873326e2e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9b0421e0b4d74b22df706578b74a58.png)
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3 . 如图,梯形ABCD所在的平面与等腰梯形ABEF所在的平面互相垂直,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/065866ec-1b4a-41df-834b-0776fd60bf14.png?resizew=257)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
平面BCE;
(2)求二面角
的余弦值;
(3)线段CE上是否存在点G,使得
平面BCF?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c75d8581bb7b2a91795852acdc07d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4ea681be3e312f3aab464cebf3e0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dfc9d1109fe41145cc892b5702d9fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/065866ec-1b4a-41df-834b-0776fd60bf14.png?resizew=257)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d6b07f069d2d823c04b0e53dabd925.png)
(3)线段CE上是否存在点G,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071159cac13097ea0928285bc1be66d8.png)
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2021-12-21更新
|
1050次组卷
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13卷引用:四川省乐山市2019-2020学年高二上学期期末数学(理)试题
四川省乐山市2019-2020学年高二上学期期末数学(理)试题【全国百强校】天津市耀华中学2018届高三年级第二次模拟考试数学(理)试题【百强校】云南省玉溪一中2018-2019学年高二上学期期末考试数学理试题上海市进才中学2017-2018学年高二下学期期末数学试题广东省广州市第八十九中学2021-2022学年高二上学期第一次月考数学试题北京市中央民族大学附属中学2022届高三12月月考数学试题重庆市暨华中学校2021-2022学年高二上学期10月月考数学试题(已下线)易错点10 立体几何-备战2022年高考数学考试易错题(新高考专用)北京市育才学校2022届高三下学期仿真测试数学试题北京市第二中学2022-2023学年高二下学期第六学段(期末)考试数学试题广东省广州市培英中学2023-2024学年高二上学期10月月考数学试题(已下线)北京市第四中学2023~2024学年高二上学期期中考试数学试题黑龙江省哈尔滨市第四中学校2023-2024学年高二上学期11月月考数学试题
解题方法
4 . 如图,在四棱锥
中,底面
是矩形,
,
,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2ca3ae2f-be89-4367-b549-9cb75aeab6c6.png?resizew=213)
(1)求证:
平面
;
(2)在棱
上是否存在点
,使得
平面
?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2ca3ae2f-be89-4367-b549-9cb75aeab6c6.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9edd2e61629ddf4c758808838d4478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a619288429fb6f75cc51f6c7fa43d03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f1bb063892dfd8f301d327e2f68feb.png)
您最近一年使用:0次
5 . 如图,在三棱柱
中,底面
为正三角形,侧棱
底面
.已知
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061285880135680/2062490574315520/STEM/4839e29f6a9349829780d0e1c652fb2a.png?resizew=149)
(1)求证:平面
平面
;
(2)求证:A1C∥平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326a3339175592bd1e793a9054d57fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0d3ac672eaba5f05e10e78453dd307.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061285880135680/2062490574315520/STEM/4839e29f6a9349829780d0e1c652fb2a.png?resizew=149)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8800db91da6b05571705f448d7677e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d5a373112efbf36f1989234a4c19aa.png)
(2)求证:A1C∥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7f44aedd494df95577ce652b04023a.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64bad2b3f41a5975acd4f266e2aa6caf.png)
您最近一年使用:0次
2018-10-27更新
|
1013次组卷
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2卷引用:【全国百强校】四川省成都石室中学2018-2019学年高二10月月考数学(理)试题