已知直三棱柱
中,侧面
为正方形,
,E,F分别为AC和
的中点,D为棱
上的动点.
.
(1)证明:
;
(2)求平面
与平面DEF所成的二面角正弦值的最小值及此时点D的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0023280949eda97787964f0a9d41ed2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/d14dff13-2f48-4595-a507-c9ae701b1f2a.png?resizew=129)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a3dc3f3a02f4400e22dec2f2fee23.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
2023·黑龙江哈尔滨·三模 查看更多[4]
黑龙江省哈尔滨市第六中学校2023届高三第三次模拟考试数学试题(已下线)第09讲 拓展三:二面角的传统法与向量法(含探索性问题,7类热点题型讲练)-【帮课堂】2023-2024学年高二数学同步学与练(人教A版2019选择性必修第一册)(已下线)第06讲 1.4.2用空间向量研究距离、夹角问题(2)(已下线)专题09 空间向量中动点的设法2种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教A版2019选择性必修第一册)
更新时间:2023-05-31 12:42:29
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】(1)设
,求
的值;
(2)已知
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0e180ef261881872e9b6cdcca762c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea4b291d50e735acd9aa77f7fd871a9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d108dc2ae1db9c4335478d1b083c0a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3681383ffea04b4a070fed014b0831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46e32c7fa85b63c2e84827226085cd8.png)
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【推荐2】已知
都是锐角,
求
,
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474929dd8e89d9ce37448ae72b48d04f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a38f780db90e20ef3de56901676122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258f7dd295360a0fa22a811dcffa3ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2deee3250f8fdccd02b472670dd23653.png)
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解题方法
【推荐1】如图1,已知
是等边三角形,点M,N分别在
,
上,
,
,
是线段
的中点.将
沿
折起到
的位置,使得平面
平面
,如图2.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2747efb77398d0aa9f7204ceb3d1601.png)
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e987ef5b2677d3b860a9882770ac718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ac7b134d8d1136f90233addaa4723f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9ab73fd4ddacc0c1524f8d742c7dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238757804254960bc40fa9d87065559.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/dbbc77ca-3a71-4068-98c7-edfed84730d2.png?resizew=340)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2747efb77398d0aa9f7204ceb3d1601.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
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(0.65)
名校
解题方法
【推荐2】如图1所示,在等腰梯形
中,
.把
沿
折起,使得
,得到四棱锥
.如图2所示.
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681346003181568/1683299991830528/STEM/2bb658f860744dde90c36ef4cef0598b.png?resizew=281)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681346003181568/1683299991830528/STEM/e219ce91a4c5418a881bd3d25c25d6eb.png?resizew=206)
(1)求证:面
面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b071045b3e40082d405395d749aa74e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed920dfefe8829694c03de363b9de9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea781ea1e67e42f1ab59768615a3172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681346003181568/1683299991830528/STEM/2bb658f860744dde90c36ef4cef0598b.png?resizew=281)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681346003181568/1683299991830528/STEM/e219ce91a4c5418a881bd3d25c25d6eb.png?resizew=206)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
您最近一年使用:0次
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适中
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【推荐3】如图,在三棱锥
中,
,
,侧面
底面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/0f38aaa5-b0b0-4c4b-815b-564b9dc08370.png?resizew=139)
(1)求证:
是直角三角形;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/0f38aaa5-b0b0-4c4b-815b-564b9dc08370.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284b8b2b9efda0cad865cd9248a95112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
您最近一年使用:0次
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(0.65)
名校
解题方法
【推荐1】如图,已知四棱锥
的底面为直角梯形,平面
平面
,且
的中点分别是
.请用空间向量知识解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/13f16cf8-d675-4056-a70f-f9bd71b441bc.png?resizew=167)
(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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d253df6d3d0d8f5f917a4dfff4854e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003162126d42a97b2c92849aa2093aea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63800b899fa56d46eeb5f3dd0ced9723.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/13f16cf8-d675-4056-a70f-f9bd71b441bc.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95beabc50316cb3394397998d3a2b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0dcdff74d82c751b8a997903cd02afd.png)
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【推荐2】如图,在四棱锥
中,
平而![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fbf67128b7cf1adff7a2f4094e22b65.png)
为
的中点,
在
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/2c17dea0-197e-4d68-8478-a448ca8d7aee.png?resizew=175)
(1)求证:
平面
;
(2)求平面
与平面
所成二面角的正弦值;
(3)点
是线段
上异于两端点的任意一点,若满足异面直线
与
所成角的余弦值为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fbf67128b7cf1adff7a2f4094e22b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51913927aa2eaa88593f6832740cf7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/2c17dea0-197e-4d68-8478-a448ca8d7aee.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc22fde9c06a220f208466c57156409d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐3】如图所示,已知三棱锥
中,
平面
,
,
,
为
上一点且满足
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851928473346048/2853475952353280/STEM/97d5624427634065bf8922902da9d5de.png?resizew=299)
(1)证明:
;
(2)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d0864e6622e150f1016a76952b2889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6813b47d087578bf054bcf56b64b42a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c705a0661e4fa244ad62c6c507072c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88550b820e51c4c4f30684f68ee6e5d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851928473346048/2853475952353280/STEM/97d5624427634065bf8922902da9d5de.png?resizew=299)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ea7dcb6e94618da188f06a68a3306d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03c5e1e4e2669563b22dcf05bfb9b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
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解题方法
【推荐1】如图,在六面体
中,
,
,且
,
平行于平面
,
平行于平面
,
.
平面
;
(2)若点
到直线
的距离为
,
为棱
的中点,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93efb8cd8d8b27301c3b15c8493721fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4519397ce1e517777092f9037e73aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e19e9ca6a8de8831644937765fb23b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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适中
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解题方法
【推荐2】如图所示,四边形
是直角梯形,
平面
.
(1)求
与平面
所成角的正弦值;
(2)求平面
和平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e11a0375f0890025a23971deadfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7a5547fd1e117de548cfb86b072bfb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/9a7cef7c-8437-48c4-ba8f-9e89c4c9eb04.png?resizew=172)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26ca000cd3c0e285cb4acf011802041.png)
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