1 . 如图,四棱锥
的底面是矩形,
,且
底面
.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421383968727040/2422388324564992/STEM/7e93bf53-7fa3-4639-aae6-93b8d899c4c2.png)
(1)求向量
在向量
上的投影;
(2)若线段
上存在异于
的一点
,使得
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e43f5f5c26f0b7315d8241445f4cd21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421383968727040/2422388324564992/STEM/7e93bf53-7fa3-4639-aae6-93b8d899c4c2.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4709f45dc9e6f3f7d7727e54cf481d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054fbd8b89b8e78589db1312573da97a.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ba0ddcffcbc270daef181d99886907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-03-18更新
|
373次组卷
|
3卷引用:陕西省西安中学2017-2018学年高二(平行班)上学期期中数学(理)试题
陕西省西安中学2017-2018学年高二(平行班)上学期期中数学(理)试题(已下线)[新教材精创] 1.1 空间向量其运算(提高练习) -人教A版高中数学选择性必修第一册甘肃省武威市等2地2022-2023学年高二上学期期中联考理科数学试题
名校
解题方法
2 . 如图,四棱锥
中,
平面
,底面
是边长为2的正方形,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/b6f336f1-5b43-465d-ba2d-9b76fedb885f.png?resizew=157)
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/b6f336f1-5b43-465d-ba2d-9b76fedb885f.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306681bd5aaa51e9c63ab3002e23dec5.png)
您最近一年使用:0次
2020-02-27更新
|
336次组卷
|
4卷引用:2020届陕西省西安市高三年级第一次质量检测数学理科试题
2020届陕西省西安市高三年级第一次质量检测数学理科试题四川省泸州市泸县第五中学2020-2021学年高三上学期第一次月考数学(理)试题(已下线)专题09 法向量秒求-2021年高考数学二轮复习解题技巧汇总(新高考地区专用)黑龙江省哈尔滨市第三十二中学2020-2021学年高三上学期期末考试理科数学试题
名校
解题方法
3 . 如图,M、N分别是边长为1的正方形ABCD的边BC、CD的中点,将正方形沿对角线AC折起,使点D不在平面ABC内,则在翻折过程中,有以下结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/aa4b5fe2-5ca0-4447-bfbe-86b2836f8ceb.png?resizew=244)
①异面直线AC与BD所成的角为定值.
②存在某个位置,使得直线AD与直线BC垂直.
③存在某个位置,使得直线MN与平面ABC所成的角为45°.
④三棱锥M-ACN体积的最大值为
.
以上所有正确结论的序号是__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/aa4b5fe2-5ca0-4447-bfbe-86b2836f8ceb.png?resizew=244)
①异面直线AC与BD所成的角为定值.
②存在某个位置,使得直线AD与直线BC垂直.
③存在某个位置,使得直线MN与平面ABC所成的角为45°.
④三棱锥M-ACN体积的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b936fbf3d1c1f9bf4beaef01cc3d4213.png)
以上所有正确结论的序号是
您最近一年使用:0次
2020-02-20更新
|
395次组卷
|
3卷引用:湖南省永州市2019-2020学年高一上学期期末数学试题
名校
4 . 如图,已知四棱锥
的底面为直角梯形,
为直角,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6455ed204853f0db2d0cbe980361245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a88dc7dc9cd668a57138e1ec71ea2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad2563f18f321e5fcf4a9f5ba1fd26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290a37874cd284fb1a8c864769ce50c9.png)
您最近一年使用:0次
2020-02-01更新
|
600次组卷
|
4卷引用:2020年陕西省高三教学质量检测卷(一)数学理科试题
2020年陕西省高三教学质量检测卷(一)数学理科试题(已下线)2020届超级全能生高考全国卷24省1月联考甲卷数学(理科)试题(已下线)专题04 立体几何-2020年高三数学(理)3-4月模拟试题汇编四川省泸县第二中学2020-2021学年高二上学期第二次月考数学(理)试题
名校
5 . 如果一个四面体的三个面是直角三角形,则其第四个面不可能是( )
A.直角三角形 | B.等边三角形 | C.等腰直角三角形 | D.钝角三角形 |
您最近一年使用:0次
2020-01-31更新
|
176次组卷
|
5卷引用:2017届上海市七宝中学高三下学期综合测试五(5月)数学试题
2017届上海市七宝中学高三下学期综合测试五(5月)数学试题山西省太原市第五中学2020-2021学年高二上学期10月月考数学(文)试题山西省太原市第五中学2020-2021学年高二上学期10月月考数学(理)试题(已下线)第30练 空间点、线、面的位置关系-2021年高考数学(理)一轮复习小题必刷(已下线)课时41 空间直线与平面的位置关系-2022年高考数学一轮复习小题多维练(上海专用)
6 . 如图(1),边长为
的正方形
中,
,
分别为
、
上的点,且
,现沿
把
剪切、拼接成如图(2)的图形,再将
,
,
沿
,
,
折起,使
、
、
三点重合于点
,如图(3).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/6036a81c-da8b-48be-9c6e-687c673771bf.png?resizew=378)
(1)求证:
;
(2)求二面角
最小时的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0a24ab1d027cb14725a6a758a6c785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1a2dbe2665ec6a0fadff8e19da12f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/6036a81c-da8b-48be-9c6e-687c673771bf.png?resizew=378)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb93407a3b472affa1748a1db672e2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe90997c0a36e47450b5cbaea013781.png)
您最近一年使用:0次
2020-01-11更新
|
472次组卷
|
3卷引用:山东省德州市2019-2020学年高三上学期期末数学试题
山东省德州市2019-2020学年高三上学期期末数学试题(已下线)专题24 盘点立体几何中折叠问题——备战2022年高考数学二轮复习常考点专题突破江苏省连云港市灌南高级中学2022-2023学年高二下学期第一次月考数学试题
名校
7 . 如图,在三棱锥
中,平面
平面
,
和
均是等腰直角三角形,
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
;
(Ⅲ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11477bf45c2ad9d554d8f2dbacb5bb67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6677a7d5693deb7e41ed70ecca68f7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2513bfc5f4c4cbc7c07725b9d59bda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99116c812715c5e15ee73d088da4c253.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
2020-01-10更新
|
1034次组卷
|
6卷引用:北京市海淀区2019-2020学年高三上学期期末数学试题
8 . 如图,在四棱锥
中,底面
为直角梯形,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a69df64811eb0866c84207f24dfae99.png)
,
,且
为
的中点,延长
交
于点
,且
在底
内的射影恰为
的中点
,
为
的中点,
为
上任意一点.
![](https://img.xkw.com/dksih/QBM/2020/1/3/2369332904345600/2369853049233408/STEM/06763c62-30e1-4c87-ae12-7fb6bafcbf3d.png)
(1)证明:平面
平面
;
(2)求平面
与平面
所成锐角二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ab41c225644b3544608d5391698d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e45b6f8cf0260912f587c04f9f2442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c0ad79161fb29ec231dd0248623ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a69df64811eb0866c84207f24dfae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41820837f147809527f692d7bad4e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef8866ccf160ddc441bf69c5d3a3d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/3/2369332904345600/2369853049233408/STEM/06763c62-30e1-4c87-ae12-7fb6bafcbf3d.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097eb599df2710ab4fa78058ab68dbc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b14cf4977ee2dac0bd5b0fca4dadc3.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b14cf4977ee2dac0bd5b0fca4dadc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a148a5584e41408fc74f8bd386b5b8.png)
您最近一年使用:0次
9 . 在三棱锥
中,已知
是等边三角形,
分别是
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b019ad93-160c-4527-b827-23e98ece4a95.png?resizew=195)
(1)证明:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabe9e96020185b19868b392fc1e3a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2855505eaa7d24edecd05ffbd5df6bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa364dffb98a94fb8285c2cdb9ad14b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b019ad93-160c-4527-b827-23e98ece4a95.png?resizew=195)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3769377d3465909f32c98246e6776d9f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
名校
10 . 如图,在四棱锥
中,底面
是矩形,
,
,
底面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4543f909-17d5-427c-ba92-0b1894219849.png?resizew=151)
(1)当
为何值时,
平面
?证明你的结论;
(2)若在
边上至少存在一点
,使
,求
的取值范围.
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4543f909-17d5-427c-ba92-0b1894219849.png?resizew=151)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83abffb64a927cf133022dd88358e7a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-01-03更新
|
1685次组卷
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6卷引用:四川省南充市高中2019-2020学年高三第一次高考适应性考试数学(文)试题
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