如图所示,已知
是以
为斜边的等腰直角三角形,点
是边
的中点,点
在边
上,且
.以
为折痕将
折起,使点
到达点
的位置,且平面
平面
,连接
.
是线段
的中点,求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2f5ccf0f933aa0d48d237f8f9d29af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](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/5618714583a99a7d6277349314851e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12c314dc346e29f4ab1e8c620ee4be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c83b7a6607eb72244afdd6a3cb020f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8010e1a73f05117a278860c1c0c7f147.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
23-24高三上·全国·阶段练习 查看更多[3]
THUSSAT2023-2024学年高三上学期1月诊断性测试数学试题浙江省嘉兴市第一中学2024届高三第一次模拟测试数学试题(已下线)第四章 立体几何解题通法 专题一 降维法 微点3 降维法(三)【基础版】
更新时间:2024-01-16 11:02:27
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在正三棱柱
中,点
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/d5e83bdd-ec47-407a-a739-17f5fac6c5d8.png?resizew=120)
(1)证明:
平面
;
(2)求平面
与平面ABC所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bb9bdc8210cadb211e5e962191f4aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/d5e83bdd-ec47-407a-a739-17f5fac6c5d8.png?resizew=120)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
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【推荐2】如图,在四棱锥
中,
是等边三角形,
平面
且
为
中点.
![](https://img.xkw.com/dksih/QBM/2021/2/22/2663757255909376/2664796301451264/STEM/3ae447b9-e186-427d-9f0a-6e68dd96f0c1.png)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0787d2cb66d00c49d3348b52acd407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8ea177384430808067769d5ebbbb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613354053d19e4919e68e30a224c6f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2021/2/22/2663757255909376/2664796301451264/STEM/3ae447b9-e186-427d-9f0a-6e68dd96f0c1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f44f2b2f82a9126223138972850aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐1】在如图所示的多面体中,
,四边形
为矩形,
,
.
![](https://img.xkw.com/dksih/QBM/2022/9/11/3064021239562240/3065827235086336/STEM/6a7ae01d7af44780aade7c2ac948155d.png?resizew=242)
(1)求证:平面
平面
;
(2)设半面
平面
,
,
平面
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbc56d42b003cbcb1fbe5c50e55b26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940078c89bad1724a5d7006a54755398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://img.xkw.com/dksih/QBM/2022/9/11/3064021239562240/3065827235086336/STEM/6a7ae01d7af44780aade7c2ac948155d.png?resizew=242)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85469a248bf54671d1f500b7812ff100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
(2)设半面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd788591c314f3b540b4b89ee5cdec8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4b51508bd85c1a47f822c39fbc39b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b755d315e74d8833765f2b1693b78d.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
为梯形,
,
为等边三角形,E在棱
上,
.
.
(2)设Q为线段
的中点,求平面
与平面
的夹角的余弦值.
![](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/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cb4637274ab9ec2fa657267e0a58ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf1e1dd06d43ec50ecc3ff2fc8cacf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
(2)设Q为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c606f78391198b6648ba0b92b60f8cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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