名校
解题方法
1 . 四棱锥
中,
面
,底面
是菱形,且
,
,过点
作直线
,
为直线
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/f6090fda-1325-4365-9236-c77a1df08600.png?resizew=211)
(1)求证:
;
(2)当面
面
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426fb5b83cf805b57abf749af88edc13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d79adc97b309e4d272c2008928204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43381f7af4a7f84eab0001247b3d4e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f03cc35b16c35ebf3e7598a0225e037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/f6090fda-1325-4365-9236-c77a1df08600.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fbd223d91fbf360a81ad183844903a.png)
(2)当面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3deffd91240585af197143926342381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8d7bf8954d8904a385be3883dd1c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b445fcf0f2a0ceba59d7e1bcb6e33d.png)
您最近一年使用:0次
2018-05-12更新
|
779次组卷
|
2卷引用:河北省衡水中学2018届高三第十七次模拟考试数学(文)试题
解题方法
2 . 如图所示的四棱锥
中,底面
与侧面
垂直,且四边形
为正方形,
,点
为边
的中点,点
在边
上,且
,过
,
,
三点的截面与平面
的交线为
,则异面直线
与
所成的角为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/a9f49858-26f1-426c-a512-6037dc29df38.png?resizew=188)
![](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/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71eda790a2fb0131ef2cac2763c84d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2cd0e29f4f800b5be77d7ccb5cfed24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/a9f49858-26f1-426c-a512-6037dc29df38.png?resizew=188)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
3 . 如图,等腰
所在平面为
,
,
.
是
的重心.平面
内经过点
的直线
将
分成两部分,把点
所在的部分沿直线
翻折,使点
到达点
(
平面
).若
在平面
内的射影
恰好在翻折前的线段
上,则线段
的长度的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3249155dc8c7a96017cdd5d4249db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1730df3a89486a6f5443f1dd405b6f.png)
![](https://img.xkw.com/dksih/QBM/2018/4/4/1916745099149312/1917569223860224/STEM/7818de07-1267-41e3-ade5-ea65e1445080.png)
您最近一年使用:0次
2018-04-05更新
|
796次组卷
|
3卷引用:云南省昆明市2018届高三教学质量检查(二统)文科数学试题
解题方法
4 . 已知正方体
的棱长为2,长度为
的线段
的一个端点
在棱
上运动,另一个端点
在正方形
内运动,则
中点的轨迹与正方体
的表面所围成的较小的几何体的体积等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
名校
5 . 如图,在棱长为
的正方体
中,点
、
是棱
、
的中点,
是底面
上(含边界)一动点,满足
,则线段
长度的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](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/9bcaae059480972b077638672a303357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-04-03更新
|
1264次组卷
|
7卷引用:北京市清华大学附属中学2017-2018学年高二期末考试文科数学试题
6 . 如图,在长方形ABCD中,AB=
,BC=1,E为线段DC上一动点,现将
AED沿AE折起,使点D在面ABC上的射影K在直线AE上,当E从D运动到C,则K所形成轨迹的长度为_______________ .
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571986073468928/1571986079236096/STEM/df00122e63f4409e8eccad9431a960c7.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571986073468928/1571986079236096/STEM/79ab5ac6420a43e8b9f16d25ee377520.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571986073468928/1571986079236096/STEM/d8b571e1-a3d1-4d50-87b4-2a72ecae461c.png?resizew=473)
您最近一年使用:0次
2019-01-30更新
|
460次组卷
|
4卷引用:2014-2015学年浙江省台州中学高二上学期期中考试文科数学试卷
2014-2015学年浙江省台州中学高二上学期期中考试文科数学试卷浙江省台州市三梅中学2020-2021学年高二上学期10月第一次教学检测数学试题(已下线)专题突破卷21 立体几何的轨迹问题(已下线)第三章 空间轨迹问题 专题五 微点2 翻折、旋转问题中的轨迹问题综合训练【培优版】
名校
解题方法
7 . 如图,在△ABC中,AB⊥AC,若AD⊥BC,则
;类似地有命题:在三棱锥A-BCD中,AD⊥平面ABC,若A点在平面BCD内的射影为M,则有
.上述命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57993f1a74ba00fd159d3939d548557f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a8c969a5dc1a3627ba59ec2e7909de.png)
A.真命题 |
B.增加条件“AB⊥AC”才是真命题 |
C.增加条件“M为△BCD的垂心”才是真命题 |
D.增加条件“三棱锥A-BCD是正三棱锥”才是真命题 |
您最近一年使用:0次
2018-03-24更新
|
820次组卷
|
2卷引用:2018届高考数学高考复习指导大二轮专题复习:专题五 立体几何 测试题5
名校
解题方法
8 . 在如图所示的三棱柱
中,已知
,点
在底面
上的射影是线段
的中点
,则直线
与直线
所成角的正切值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/f3b285a9-e3f2-4da3-9266-93f28bbcebbe.png?resizew=298)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2fe250de0d1000ca8354b2792ee306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc526324e78e4d9226d1b537f27845a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/f3b285a9-e3f2-4da3-9266-93f28bbcebbe.png?resizew=298)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-03-02更新
|
706次组卷
|
3卷引用:山西省晋城市2018届高三上学期第一次模拟考试数学(理)试题
山西省晋城市2018届高三上学期第一次模拟考试数学(理)试题(已下线)2018年高考数学备考中等生百日捷进提升系列(捷进提升篇)专题08 立体几何重庆市万州第二高级中学2023届高三下学期第二次诊断数学试题
名校
9 . 如图,由直三棱柱
和四棱锥
构成的几何体中,
,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(I)求证:
;
(II)若M为
中点,求证:
平面
;
(III)在线段BC上(含端点)是否存在点P,使直线DP与平面
所成的角为
?若存在,求
得值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b3e8bee41beb61f3c4afdc554cb455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba90c0290ae59b9e4f150a48eed8de4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98cf9cb5b6b6de8dd40dce5628d77a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a773326771e4d98979061f9949ee0af0.png)
(II)若M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eb89294b31ffdd2680b4361e8994d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1477ae90a240deba97f8dadf4d7c41aa.png)
(III)在线段BC上(含端点)是否存在点P,使直线DP与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1477ae90a240deba97f8dadf4d7c41aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fb46419d4c5868342f6615adcd36d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/f028d440-a7d1-4f85-8e59-f48b2e94ba81.png?resizew=148)
您最近一年使用:0次
2018-05-19更新
|
3601次组卷
|
12卷引用:2017届北京市海淀区高三下学期期中考试数学理试卷
2017届北京市海淀区高三下学期期中考试数学理试卷河北省衡水中学2016-2017学年高一下学期期末考试数学(理)试题【全国市级联考】天津市河北区2018年高三二模数学(理)试题湖南省怀化市2018-2019学年高三下学期期末博览联考数学(理)试题山西省山西大学附属中学2018-2019学年高二上学期期中数学(理)试题(已下线)理科数学-2020年高考押题预测卷01(新课标Ⅰ卷)《2020年高考押题预测卷》2020届天津市第一百中学高考模拟数学试题江苏省苏州市新草桥中学2020-2021学年高三上学期10月月考数学试题湖北省武汉市蔡甸区汉阳一中2020-2021学年高二上学期9月月考数学试题北京市第五十七中学2021-2022学年高二10月月考数学试题北京第五十七中学2020-2021学年高二上学期期末试题北京市东城区第一七一中学2024届高三上学期12月月考数学试题
10 . 如图,四面体
的三条棱
,
,
两两垂直,
,
,
为四面体
外一点,给出下列命题.
![](https://img.xkw.com/dksih/QBM/2018/2/3/1873938365046784/1874919819714560/STEM/388c2d4d245d45b782242ada88853f3d.png?resizew=157)
①不存在点
,使四面体
有三个面是直角三角形;
②不存在点
,使四面体
是正三棱锥;
③存在点
,使
与
垂直并且相等;
④存在无数个点
,使点
在四面体
的外接球面上.其中真命题的序号是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50bf7d7fa347c09dedde116bb787a3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://img.xkw.com/dksih/QBM/2018/2/3/1873938365046784/1874919819714560/STEM/388c2d4d245d45b782242ada88853f3d.png?resizew=157)
①不存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②不存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
③存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
④存在无数个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.①② | B.②③ | C.③ | D.③④ |
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