1 . 如图,在长方体
中,
,
分别是线段
,
的中点.
平面
;
(2)若
,直线
与
所成角的余弦值是
,求四面体
的体积.
![](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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635a764c14e95e53a7a160d84706a449.png)
您最近一年使用:0次
2022-07-10更新
|
622次组卷
|
6卷引用:安徽省宣城市三校2022-2023学年高二上学期期初联考数学试题
安徽省宣城市三校2022-2023学年高二上学期期初联考数学试题福建省泉州第一中学2022-2023学年高二上学期暑假返校数学试题湖南省五市十校教研教改共同体2021-2022学年高一下学期期末数学试题湖北省黄冈市黄州中学(黄冈外校)2022-2023学年高一下学期第七次阶段性测试数学试题(已下线)8.5.3 平面与平面平行(第2课时) 平面与平面平行的性质(分层作业)-【上好课】北京市第八十中学2023-2024学年高一下学期期中考试数学试题
名校
2 . 如图,在等腰直角三角形
中,
分别是
上的点,且
分别为
的中点,现将
沿
折起,得到四棱锥
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23853b5555468f9d803713d1d9353750.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3e6740be-3953-4f28-91ea-930c1735e3f6.png?resizew=400)
(1)证明:
平面
;
(2)在翻折的过程中,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084ce748ea72556d4d575d84d0ea594f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6b04dcd5a34b8125696faf552ab63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79c1b3d8a1ea4d9370996706199e5a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0fa96c746ceab61c043cbb95b7d2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23853b5555468f9d803713d1d9353750.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3e6740be-3953-4f28-91ea-930c1735e3f6.png?resizew=400)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)在翻折的过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
您最近一年使用:0次
2022-06-18更新
|
1513次组卷
|
11卷引用:安徽省淮南一中2020-2021学年高二下学期开学考理科数学试题
安徽省淮南一中2020-2021学年高二下学期开学考理科数学试题安徽省江淮名校2020-2021学年高二下学期开学联考数学(理)试题吉林省松原市宁江区吉林油田高级中学2021-2022学年高二上学期期初数学考试试题陕西省西安市长安区第一中学2020-2021学年高二上学期期末数学(理)试题(已下线)专题9.10—立体几何—二面角2—2022届高三数学一轮复习精讲精练湖北省宜昌市示范高中教学协作体2021-2022学年高二上学期期中数学试题贵州省遵义市第五中学2021-2022学年高二上学期期中考试数学(理)试题福建省福州第一中学2021-2022学年高一下学期期末考试数学试题(已下线)专题24 立体几何解答题最全归纳总结-1(已下线)第07讲 向量法求距离、探索性及折叠问题 (练)(已下线)1.2.4 二面角
名校
解题方法
3 . 如图,四棱锥
的底面是矩形,平面
平面
,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899377870831616/2909306660012032/STEM/9b3edcb6-eb57-4209-9e6c-f40b98d2a52e.png?resizew=195)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
:
(2)求点P到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98b0b77d5910a7afe5da22c4586095d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7366da07065712da11602f4afce8cbed.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899377870831616/2909306660012032/STEM/9b3edcb6-eb57-4209-9e6c-f40b98d2a52e.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求点P到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
2022-02-04更新
|
429次组卷
|
2卷引用:安徽省滁州市定远县育才学校2021-2022学年高三下学期开学考试数学(文)试题
名校
4 . 如图,四棱锥
的底面是矩形,平面
平面
,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899364410368000/2909296488448000/STEM/f86988ac-5adf-4ce0-bf46-f5a39c9884a6.png?resizew=203)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb864b2f3bb242f12478063b1aca2596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7366da07065712da11602f4afce8cbed.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899364410368000/2909296488448000/STEM/f86988ac-5adf-4ce0-bf46-f5a39c9884a6.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c6e025c4876a06fc3a82ae5d476779.png)
您最近一年使用:0次
2022-02-04更新
|
314次组卷
|
2卷引用:安徽省滁州市定远县育才学校2021-2022学年高三下学期开学考试数学(理)试题
5 . 如图,六面体
中,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/c7aa7474-a02a-4d64-bfe4-1e3f846e5897.png?resizew=240)
(1)求证:
;
(2)若
,平面
平面
,
,
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04de6e3d84ddf7da3dc4fab26e59df46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/c7aa7474-a02a-4d64-bfe4-1e3f846e5897.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab79d395d5aa7500d0606dd94b6319ff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3ce43d216ad9d22ccfa0ec656266ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940078c89bad1724a5d7006a54755398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53509459aad2e9f59f412f43b6f775d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31815b1f3bcb36edacb318c198f41d4.png)
您最近一年使用:0次
2020-12-08更新
|
384次组卷
|
2卷引用:安徽省六安市第一中学2020-2021学年高二下学期开学考试数学(文)试题
名校
6 . 如图,在三棱台ABC﹣A1B1C1中,D,E分别是AB,AC的中点,B1E⊥平面ABC,△AB1C是等边三角形,AB=2A1B1,AC=2BC,∠ACB=90°.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110811852365824/2111689648562176/STEM/91a9089e0c8a45e083aad6aad30ce27c.png?resizew=183)
(1)证明:B1C∥平面A1DE;
(2)求二面角A﹣BB1﹣C的正弦值.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110811852365824/2111689648562176/STEM/91a9089e0c8a45e083aad6aad30ce27c.png?resizew=183)
(1)证明:B1C∥平面A1DE;
(2)求二面角A﹣BB1﹣C的正弦值.
您最近一年使用:0次
2018-12-03更新
|
1282次组卷
|
6卷引用:安徽省阜阳市太和中学2019-2020学年高二下学期开学考试数学(理)试题