如图①所示,长方形
中,
,
,点
是边
靠近点
的三等分点,将△
沿
翻折到△
,连接
,
,得到图②的四棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/064d0cf4-2a78-4aef-b517-bb802a20d845.png?resizew=305)
(1)求四棱锥
的体积的最大值;
(2)设
的大小为
,若
,求平面
和平面
夹角余弦值的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c745df4f226027778d5fe45b6501b822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec53c9cc69c2e3943ec8df5d5b5d44c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/064d0cf4-2a78-4aef-b517-bb802a20d845.png?resizew=305)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec53c9cc69c2e3943ec8df5d5b5d44c7.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212e8c352c4d9b022a057d7d7fa7dd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67c89ceb040588c165ad7a8030906c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c745df4f226027778d5fe45b6501b822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
22-23高二上·重庆九龙坡·期中 查看更多[9]
重庆市外国语学校(四川外国语大学附属外国语学校)2022-2023学年高二上学期期中数学试题吉林省长春市长春吉大附中实验学校2022-2023学年高三上学期第五次摸底考试数学试题河北省保定市重点高中2022-2023学年高三上学期11月期中数学试题(已下线)模块十一 立体几何-2(已下线)模块四 专题6 立体几何3.4向量在立体几何中的应用 测试卷-2022-2023学年高二上学期数学北师大版(2019)选择性必修第一册(已下线)第11讲 第一章 空间向量与立体几何 章末题型大总结(2)黑龙江省哈尔滨市第九中学校2024届高三上学期12月月考数学试题福建省龙岩市上杭县第一中学2024届高三上学期12月月考数学试题
更新时间:2022-11-08 10:11:54
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】在三棱台
中,
,
, 侧面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c93878e0291b61da2f432feadb70b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/98cf9ec8-5dad-41b5-b63d-78d595ec1fcf.png?resizew=162)
(1)求证:
平面
;
(2)求证:
是直角三角形;
(3)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d0543f5a584b4b6e4714a467a104c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973bc82f603ff7b3ab28bd238fbe8c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c93878e0291b61da2f432feadb70b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/98cf9ec8-5dad-41b5-b63d-78d595ec1fcf.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5f9ef971747d2d5bbc5823797a7a65.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,已知四边形
是直角梯形,
,
平面
是
的中点,E是
的中点,
的面积为
,四棱锥
的体积为
.
平面
;
(2)若P是线段
上一动点,当二面角
的大小为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ddc0e6db5f4acd18f4765e05d44bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ec59cea09acc43a8178af846693cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b39b0cfa27b633312db83601cf0359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5ba482836565abad208665cf7b9972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6093eebca8f3ff82ce9298feb197e955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895da13331cb525f5850d7b7a02a847.png)
(2)若P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74a85c6a0b3e431dc184d58f957090a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297cc0f9553ef0c5b537c5581eee934c.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐1】如图,正四棱锥
中,
,
分别为
的中点,设
为线段
上任意一点.
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572157961822208/1572157967867904/STEM/2cb4b0cf-c23f-469d-869b-bc6d6499d2c0.png?resizew=180)
(1)求证:
;
(2)当直线
与平面
所成的角取得最大值时,求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169652f0bb8fccd16ffd484a2f5317b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93767331e9bac06a564973a9f4fc663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f9759f5185ecb46de48720ce636860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bece5ce433da3660b3290b64ee1a237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572157961822208/1572157967867904/STEM/2cb4b0cf-c23f-469d-869b-bc6d6499d2c0.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f6e5c22af78069a3692e3db101e020.png)
您最近一年使用:0次
解答题-问答题
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(0.4)
名校
解题方法
【推荐2】如图所示,在四棱锥
中,四边形
是平行四边形,
平面
,点M在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/8d6f8847-bfb4-495e-a67a-5e1069796819.png?resizew=190)
(1)求实数a的值;
(2)求平面
与平面
夹角的余弦值;
(3)若点N是直线
上的动点,求
面积的最小值,并说明此时点N的位置.
![](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/e9811925f0d82d7971d1716c3109b3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a28a3c67928bdc36505ce6cd3907c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2dfd7ef0c3a82a1e6944e0bf51be75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/8d6f8847-bfb4-495e-a67a-5e1069796819.png?resizew=190)
(1)求实数a的值;
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fcce61c3d158b5331d6de10db3fb55d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
(3)若点N是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35fe4d4160c1b1c9bdb52cf72b451b0b.png)
您最近一年使用:0次