1 . 如图,在三棱柱
中,平面
平面
,底面
是等边三角形,侧
是菱形,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650014762876928/2651627731943424/STEM/a7edef91-da79-4bc0-aadc-92521a6c6132.png)
(1)证明
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900e00a3609e6043af1034761d4d65f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650014762876928/2651627731943424/STEM/a7edef91-da79-4bc0-aadc-92521a6c6132.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46340bfad3505ef24f4916a61dd1a5e.png)
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解题方法
2 . 如图,正四棱锥
中,底面ABCD的边长为4,
,E为PA的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/31/2648172006858752/2650731563114496/STEM/42ae06088033449cb89444fd4ebb0660.png?resizew=227)
(1)求证:
平面EBD.
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://img.xkw.com/dksih/QBM/2021/1/31/2648172006858752/2650731563114496/STEM/42ae06088033449cb89444fd4ebb0660.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb178784aa857d4d4683e650273f054.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52753d89bf58589e2e83b19bd3d140b8.png)
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3 . 如图,在四棱锥
中,底面
是矩形,
平面
,
为
上的动点.
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644485862883328/2645412115054592/STEM/a9bfcc08-2dd9-4285-ba56-c379d89e954b.png?resizew=255)
(1)若
平面
,请确定点
的位置,并说明理由.
(2)设
,
,若
,求二面角
的正弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/2021/1/26/2644485862883328/2645412115054592/STEM/a9bfcc08-2dd9-4285-ba56-c379d89e954b.png?resizew=255)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51471daa86588d2f24b364953a66e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
您最近一年使用:0次
2021-01-27更新
|
667次组卷
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5卷引用:广西河池市2020-2021学年高二上学期期末数学(理)试题
名校
解题方法
4 . 如图,在直三棱柱
中,
、
分别为棱
、
的中点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/f05e1a77-92f2-498a-a719-4632cf30e733.png?resizew=152)
(1)求证:平面
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/f05e1a77-92f2-498a-a719-4632cf30e733.png?resizew=152)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038b970e78494969975c94dc53a33c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
您最近一年使用:0次
2021-04-21更新
|
2088次组卷
|
16卷引用:广西梧州市藤县第六中学2021-2022学年高二上学期期末热身考试数学(文)试题
广西梧州市藤县第六中学2021-2022学年高二上学期期末热身考试数学(文)试题甘肃省武威市民勤县第四中学2020-2021学年高一上学期期末考试(实验班)数学试题甘肃省武威市民勤县第四中学2020-2021学年高一上学期期末考试(普通班)数学试题沪教版(2020) 必修第三册 新课改一课一练 期末测试B湖北省武汉市八校联合体2020-2021学年高一下学期期末数学试题【全国百强校】江苏省清江中学2019届高三第二次教学质量调研数学试题【校级联考】江苏省南通市南通市通州区、海门市2019届高三第二次质量调研数学试题【全国百强校】江苏省如东高级中学2018-2019学年高二上学期第二次月考数学试题安徽省芜湖市镜湖区师范大学附中2019-2020学年高二上学期期中数学(文)试题江西省九江市第一中学2018-2019学年高一上学期第二次月考数学试题安徽师范大学附属中学2019-2020学年高二上学期期中数学(文)试题(已下线)【新教材精创】11.4.2平面与平面垂直(第1课时)练习(1)江苏省淮安市淮阴中学2020届高三下学期5月高考模拟数学试题(已下线)第六章 立体几何初步(基础过关)-2020-2021学年高一数学单元测试定心卷(北师大2019版必修第二册)(已下线)专题11.3空间中的垂直关系(A卷基础篇)-2020-2021学年高一数学必修第四册同步单元AB卷(新教材人教B版)四川省巴中市通江县通江中学2021-2022学年高二上学期11月月考数学理科试题
名校
解题方法
5 . 如图,在四棱锥P-ABCD中,底面ABCD是正方形,侧面
底面ABCD,E为侧棱PD上一点.
平面ABE;
(II)求证:
;
(III)若E为PD中点,平面ABE与侧棱PC交于点F,且
,求四棱锥P-ABFE的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6785c7c85a503531649f9c9b4cbfcf04.png)
(II)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
(III)若E为PD中点,平面ABE与侧棱PC交于点F,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931bbffda5e872703c9947eccc47ede2.png)
您最近一年使用:0次
2020-11-06更新
|
1173次组卷
|
6卷引用:广西桂林市2020-2021学年高一上学期期末数学试题
6 . 在四棱锥
中,已知底面
为正方形,
底面
,且
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/8c58fcf8-ae1e-4aa7-856f-5229d73e95f8.png?resizew=143)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.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/2022/12/29/8c58fcf8-ae1e-4aa7-856f-5229d73e95f8.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a351d71fa01d3f5920e374a8ee7b524.png)
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解题方法
7 . 在直三棱柱中,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526413243432960/2527123456770048/STEM/b541a0f67096456caf179604c5184b7d.png?resizew=155)
(1)求证:
平面
;
(2)求直线
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc670f1937399b7b64316d2ae283e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526413243432960/2527123456770048/STEM/b541a0f67096456caf179604c5184b7d.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
您最近一年使用:0次
2020-08-13更新
|
1044次组卷
|
11卷引用:广西百色市2022-2023学年高二上学期期末教学质量调研测试数学试题
广西百色市2022-2023学年高二上学期期末教学质量调研测试数学试题【新教材精创】1.4.2+用空间向量研究距离、夹角问题(1)教学设计-人教A版高中数学选择性必修第一册【新教材精创】1.4.2+用空间向量研究距离、夹角问题(1)导学案-人教A版高中数学选择性必修第一册(已下线)1.4.2 空间向量的应用(二)(精练)-2020-2021学年一隅三反系列之高二数学新教材选择性必修第一册(人教版A版)山东省青岛市青岛第一中学2021-2022学年高二上学期10月月考数学试题浙江省金华市曙光学校2021-2022学年高二上学期10月月考数学试题福建省泉州师范学院附属鹏峰中学2022-2023学年高二上学期8月份统一考试数学试题山西省浑源县第七中学校2022-2023学年高二上学期第一次阶段性学情检测数学试题广东省广州市第六十五中学2022-2023学年高二上学期10月月考数学试题广东省惠州市龙门县高级中学2022-2023学年高二上学期11月月考数学试题福建省莆田市第二中学2022-2023学年高二上学期第二次月考数学试题
解题方法
8 . 如图,在三棱柱ABC-A1B1C1中,四边形ACC1A1是矩形,平面ACC1A1⊥平面ABC,且D,E,F分别是线段AB,BC,CC1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/899fa9c2-f6ae-4ee2-91da-f7e6ad94c64d.png?resizew=137)
(1)证明:EF//平面A1CD;
(2)若△ABC是边长为4的等边三角形,且AA1=6,求三棱锥A1-CDF的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/899fa9c2-f6ae-4ee2-91da-f7e6ad94c64d.png?resizew=137)
(1)证明:EF//平面A1CD;
(2)若△ABC是边长为4的等边三角形,且AA1=6,求三棱锥A1-CDF的体积.
您最近一年使用:0次
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解题方法
9 . 如图,已知圆柱内有一个三棱锥
,
为圆柱的一条母线,
为下底面圆
的直径,
为圆柱上底面圆的圆心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2c1108b6-a724-4e15-a4c3-af2e9767e411.png?resizew=135)
(1)若点
为下底面圆弧上与
,
不重合的点,求证:
.
(2)若
也为下底面圆
的直径,且与
不重合,求证:
面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2c1108b6-a724-4e15-a4c3-af2e9767e411.png?resizew=135)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f60db833d4ff6b92c78029e8264ca1c.png)
(2)若
![](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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218661d1f4436696d1f506944c8be593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2020-08-04更新
|
225次组卷
|
3卷引用:广西钦州市2019-2020学年高一下学期期末教学质量监测数学试题
广西钦州市2019-2020学年高一下学期期末教学质量监测数学试题(已下线)2.3.3 直线与平面垂直的性质-2020-2021学年高一数学课时同步练(人教A版必修2)山西省寿阳县第一中学2020-2021学年高二上学期第二次月考数学(文)试题
名校
10 . 如图,在四棱锥
中,底面
为边长为3的正方形,
,
,平面
平面
,
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/326f9648-d4d1-44ef-8e37-4f7c5c75ea17.png?resizew=198)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的余弦值.
![](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/15721f71a6c8b071ff621f2ffe73e977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71826134c3080aa75becc655a9089855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3e2bed5ce5fe466395d2f5743d335b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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6卷引用:广西河池市2020-2021学年高三上学期期末数学(理)试题
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