名校
解题方法
1 . 已知菱形
的边长为
,
,沿对角线
将菱形
折起,使得二面角
为钝二面角,且折后所得四面体
外接球的表面积为
,则二面角
的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4d9a7c9b2ee0253a3a11d5117f9f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
您最近一年使用:0次
2020-05-19更新
|
475次组卷
|
2卷引用:2020届辽宁省辽阳市高三二模考试数学(理)试题
解题方法
2 . 如图,在正方体
中,点
为线段
的中点,设点
在线段
上二面角
的平面角为
,用图中字母表示角
为__________ ,
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1d9cb67314af122defeaa715365a9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/3639c2e2-925e-413b-9fa3-f53053205aed.png?resizew=187)
您最近一年使用:0次
解题方法
3 . 在
中,
,
,AB的垂直平分线分别交AB,AC于D、E(图一),沿DE将
折起,使得平面
平面BDEC(图二).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/5f7ad44c-cc5e-4c77-9973-27d4d74c386e.png?resizew=370)
(1)若F是AB的中点,求证:
平面ADE.
(2)P是AC上任意一点,求证:平面
平面PBE.
(3)P是AC上一点,且
平面PBE,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/5f7ad44c-cc5e-4c77-9973-27d4d74c386e.png?resizew=370)
(1)若F是AB的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
(2)P是AC上任意一点,求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
(3)P是AC上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa92fbb689ce6f9ab3384918f48774.png)
您最近一年使用:0次
名校
4 . 如图,直三棱柱
中,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/04995d23-7b87-42b4-af22-6ed033682091.png?resizew=163)
(1)证明:
平面
;
(2)已知
与平面
所成的角为30°,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/04995d23-7b87-42b4-af22-6ed033682091.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319d234a0586478d4e73020d48b3a10.png)
您最近一年使用:0次
2020-05-13更新
|
2757次组卷
|
16卷引用:【市级联考】辽宁省丹东市2019届高三总复习质量测试(一)理科数学试题
【市级联考】辽宁省丹东市2019届高三总复习质量测试(一)理科数学试题2020届河北省衡水中学高三高考考前密卷(一)数学(理)试题四川省广安市广安中学2019-2020学年高二9月月考(文)数学试题黑龙江省鹤岗市第一中学2019-2020学年高三上学期10月月考数学(理)试题江西省吉安市2019-2020学年高三上学期期中数学(理)试题江西省宜春市上高县第二中学2019-2020学年高三上学期11月月考数学(理)试题湖北省襄阳市2019-2020学年高二上学期期末数学试题2020届河北省衡水中学高三年级上学期五调考试数学(理科)试题2020届黑龙江省实验中学高三上学期期末考试数学(理)试题四川省棠湖中学2019-2020学年高三下学期第二次月考数学(理)试题(已下线)专题01 平行、垂直问题的证明(第三篇)-备战2020年高考数学大题精做之解答题题型全覆盖山东济南市历城第二中学2019-2020学年高一下学期开学考试数学试题江苏省无锡市江阴市高级中学2019-2020学年高二下学期期中数学试题湖北省宜昌市天问高中2019-2020学年高二(下)开学数学试题人教B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 1.2 空间向量在立体几何中的应用 1.2.4 二面角甘肃省永昌县第一中学2020-2021学年高三上学期第一次月考数学理试题
5 . 如图,四棱锥P-ABCD中,底面ABCD是边长为3的菱形,∠ABC=60°.PA⊥面ABCD,且PA=3.F在棱PA上,且AF=1,E在棱PD上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a282518e-0061-4d88-ad90-44a90f7c71bb.png?resizew=180)
(Ⅰ)若CE∥面BDF,求PE:ED的值;
(Ⅱ)求二面角B-DF-A的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a282518e-0061-4d88-ad90-44a90f7c71bb.png?resizew=180)
(Ⅰ)若CE∥面BDF,求PE:ED的值;
(Ⅱ)求二面角B-DF-A的大小.
您最近一年使用:0次
6 . 正三棱柱
的所有棱长都相等,
是
中点,则二面角
的正切值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96669b8b29a56d2a33546aa7af02979.png)
您最近一年使用:0次
名校
解题方法
7 . 如图,在四面体
中,
,
.
![](https://img.xkw.com/dksih/QBM/2018/5/4/1937934497062912/1940417073119232/STEM/b18a120f63c04bcc99867ec49293adbd.png?resizew=297)
(Ⅰ)证明:
;
(Ⅱ)若
,
,四面体
的体积为2,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://img.xkw.com/dksih/QBM/2018/5/4/1937934497062912/1940417073119232/STEM/b18a120f63c04bcc99867ec49293adbd.png?resizew=297)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9dab0293dbad92fe84bad6b0d957bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
您最近一年使用:0次
2018-05-07更新
|
1000次组卷
|
4卷引用:【全国市级联考】辽宁省丹东市2018年高三模拟(二)理科数学试题
8 . 如图,
,
,
,
是圆柱底面圆周的四等分点,
是圆心,
,
,
与底面
垂直,底面圆的直径等于圆柱的高.
![](https://img.xkw.com/dksih/QBM/2017/12/14/1838195046211584/1838825250193408/STEM/4225bf058bc747149122fe7ebbfbea0e.png?resizew=197)
(1)证明:
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2017/12/14/1838195046211584/1838825250193408/STEM/4225bf058bc747149122fe7ebbfbea0e.png?resizew=197)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7768503b1ad4775258b2f1a71c413086.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b89a4044894b25f52e6efa47332f055.png)
您最近一年使用:0次
9 . 如图所示,三棱柱ABC -A1B1C1中,已知AB⊥侧面BB1C1C,AB =BC =1,BB1=2,∠BCC1=60°.
(Ⅰ)求证:C1B⊥平面ABC ;
(Ⅱ)E是棱CC1所在直线上的一点,若二面角A-B1E-B的正弦值为
,求CE 的长.
(Ⅰ)求证:C1B⊥平面ABC ;
(Ⅱ)E是棱CC1所在直线上的一点,若二面角A-B1E-B的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/163f46d260a114fb4afe843ff60c19d7.png)
![](https://img.xkw.com/dksih/QBM/2017/9/20/1778268783591424/1779423164923904/STEM/c40e6afd2fbd438780fd4b87ba9f0731.png?resizew=125)
您最近一年使用:0次