名校
1 . 如图,在三棱锥
中,
,
,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979504440737792/2980892132352000/STEM/af0bd20d-198d-4449-9b87-b4d942f67fef.png?resizew=184)
(1)证明:
;
(2)若三棱锥
的体积为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94117be6898f465b621b00d996cea62a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979504440737792/2980892132352000/STEM/af0bd20d-198d-4449-9b87-b4d942f67fef.png?resizew=184)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a916d31a199e250556fb7478d9f57f7.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e781794380369986325b56e705014096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
您最近一年使用:0次
2022-05-16更新
|
991次组卷
|
3卷引用:西藏自治区拉萨中学2023届高三下学期3月数学(理)检测试题
名校
解题方法
2 . 如图,四棱锥
中,底面
是边长为2的正方形,
,
,且
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941239547174912/2943103781117952/STEM/4f1ea8ce11fd4cc2aae201d7ec1ce513.png?resizew=242)
(1)求平面
与平面
夹角的余弦值;
(2)在线段
上是否存在点
,使得点
到平面
的距离为
?若存在,确定点的位置;若不存在,请说明理由.
![](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/f0063f3f48e49f2970ec7f097567cef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.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/2022/3/21/2941239547174912/2943103781117952/STEM/4f1ea8ce11fd4cc2aae201d7ec1ce513.png?resizew=242)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1dcba40b263c1119ea0a36651c7812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69d166677557cadb3da32b4a7e152e3.png)
您最近一年使用:0次
2022-03-24更新
|
839次组卷
|
5卷引用:西藏拉萨中学2021-2022学年高二3月月考数学(理)试题
西藏拉萨中学2021-2022学年高二3月月考数学(理)试题河北省石家庄市2021-2022学年高二上学期期末数学试题(已下线)高二数学下学期期末全真模拟卷(1)(考试范围:高中全部内容)-2021-2022学年高二数学下学期考试满分全攻略(人教A版2019选修第二册+第三册)福建省三明市第二中学2022-2023学年高二上学期开学适应性练习数学试题江苏省南京市第一中学2022-2023学年高二下学期期末数学试题
解题方法
3 . 在矩形
中,
,
,
在
上运动,设
,将
沿
折起,使得平面
垂直于平面
,
长最小时
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3ebe2470b9f98ce309de1ce700a4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c3b7bc938bd932c06cfd2ad09bc88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/6cf42247-3218-44ec-95ab-c3e72cea5f4b.png?resizew=220)
您最近一年使用:0次
4 . 在如图所示的几何体中,四边形
是菱形,四边形
是矩形,平面
平面
,
,
,
,
为
的中点,
为线段
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/3cb110b1-ec71-43f2-9c19-4b98dd9daa0c.png?resizew=181)
(1)求证:
;
(2)若二面角
的大小为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ab4fdfc612c9fa2dd8ae24904192d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61804389aabf1e02857b748dd103700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5564681937f41e1489d69b20a71f9222.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/3cb110b1-ec71-43f2-9c19-4b98dd9daa0c.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068a4fe65a8083c66aab992d52a53578.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5fa459d6c8ae34b54bb973c6f2aea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50c887867908030d361451a2e85bbe4.png)
您最近一年使用:0次
2019-11-14更新
|
693次组卷
|
4卷引用:西藏拉萨中学2019-2020学年高三第六次月考数学(理)试题
5 . 如图1,在梯形
中,
,
,
,过
,
分别作
的垂线,垂足分别为
,
,已知
,
,将梯形
沿
,
同侧折起,使得平面
平面
,平面
平面
,得到图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6d10f95d-c4e1-4bfa-9979-acb575ef5bd0.png?resizew=301)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.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/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cfba3cfc718f3684addfa740a43a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6d10f95d-c4e1-4bfa-9979-acb575ef5bd0.png?resizew=301)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b3b18b7f7e08f195bcdf3acfffff3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1d31ad2890e57d54c13663b82495ef.png)
您最近一年使用:0次
2019-06-18更新
|
1131次组卷
|
5卷引用:【市级联考】西藏拉萨市2019届高三第三次模拟考试数学(文)试题
【市级联考】西藏拉萨市2019届高三第三次模拟考试数学(文)试题福建省莆田市莆田第七中学2019-2020学年高三上学期期中数学(文)试题2019届新疆维吾尔自治区高三年级第三次毕业诊断及模拟测试文科数学试题2020届四川省宜宾市叙州区第一中学校高三上学期期末考试数学(文)试题(已下线)专题8.4 直线、平面平行的判定及其性质(练)-浙江版《2020年高考一轮复习讲练测》
名校
解题方法
6 . 如图,在
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
,
是斜边
的中点,将
沿直线
翻折,若在翻折过程中存在某个位置,使得
,则
的取值范围是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/72176918-fa52-4b6e-a209-d4554075167a.png?resizew=275)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ef38fc225d102bcd4f35bab70078c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab03556c333ab0b55fe86c937b2a5763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324aae9536a57bcaf320795715f20b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/72176918-fa52-4b6e-a209-d4554075167a.png?resizew=275)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-10-26更新
|
1437次组卷
|
2卷引用:【全国百强校】西藏自治区拉萨中学2019届高三第五次月考数学(理)试题