如图,在四棱锥
中, 已知
底面
, 底面
是正方形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/a6b85879-3c8c-42d8-b823-a40468058c00.png?resizew=160)
(1)求证: 直线
平面
;
(2)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b0de5237c88a9bfffc207bab17191a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/a6b85879-3c8c-42d8-b823-a40468058c00.png?resizew=160)
(1)求证: 直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c306e49fd17d29f0174793cb5e1decbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d39f37441ee55dbc8f1a6ca199a66b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3142b1af4ce67d3e55417b4c0de257.png)
22-23高二上·重庆云阳·期末 查看更多[4]
重庆市云阳凤鸣中学校2022-2023学年高二上学期期末数学试题河南省周口市项城市第三高级中学2022-2023学年高二下学期开学考试数学试题(已下线)江苏省盐城市、南京市2022届高三上学期1月第一次模拟考试数学试题变式题17-22四川省雅安市名山区第三中学2023-2024学年高二上学期12月月考数学试题
更新时间:2023-01-10 23:17:07
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解答题-证明题
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【推荐1】如图,在四棱锥
中,底面
是正方形,
平面
,
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/60361ff2-2318-4ff9-a487-9a5a7b37637d.png?resizew=144)
(1)求证:
;
(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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2942390d02efaff57473d103f7950a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/60361ff2-2318-4ff9-a487-9a5a7b37637d.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc55d282b5786fc0ac1fcf7e706e3a1.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35614aff055b98b76ca262f64e629d.png)
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【推荐2】如图,ABCD是矩形,AD⊥AE,BE=BC,且BF⊥平面ACE交CE于F.
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618415061139456/2623042655723520/STEM/4ea39159-b0d3-45e5-a378-65971fbc034d.png?resizew=237)
(1)求证:AE⊥平面BCE;
(2)求证:AE
平面BFD.
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618415061139456/2623042655723520/STEM/4ea39159-b0d3-45e5-a378-65971fbc034d.png?resizew=237)
(1)求证:AE⊥平面BCE;
(2)求证:AE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
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【推荐1】如图,在三棱柱
中,面
为正方形,面
为菱形,
,侧面
面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/ab625523-e51a-4ca5-beb9-106bfad92feb.png?resizew=180)
(1)求证:
面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4bc3e0ac2677701750f289f6db2a7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/ab625523-e51a-4ca5-beb9-106bfad92feb.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee96c4a8aa9217a1052f4a400aa06d0.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cebc1b9472488bfb8f0db1c723fef5.png)
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解题方法
【推荐2】如图,在矩形
中,
,
,
是
的中点,将
沿
向上折起,使平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9e5a462c0ca3b9e2c603750a3b433b.png)
![](https://img.xkw.com/dksih/QBM/2018/4/20/1928025364922368/1931135018344448/STEM/8119c471c9004b58b2c5b2f39dd09971.png?resizew=357)
(1)求证:
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a11cb104b04c4e6a1be700e81da279a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a2712f9cc643d4983d37c9dfe880ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9e5a462c0ca3b9e2c603750a3b433b.png)
![](https://img.xkw.com/dksih/QBM/2018/4/20/1928025364922368/1931135018344448/STEM/8119c471c9004b58b2c5b2f39dd09971.png?resizew=357)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f304789d5bcf31d9998fd4d920cd157.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5424feb7ee793897a1eda83dc90a1e.png)
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【推荐1】已知四棱锥
的底面
为菱形,且
,
.
(1)证明:
;
(2)若
,求二面角
的正弦值.
![](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/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15eae3c2cb4274a947f6a011960934d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/f5e24098-19c3-41e1-8611-51f88ffc4731.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff75dba94463cbd849f1257c0574679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
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【推荐2】如图在长方体
中,
,
,
,M是
的中点.以D为原点,
,
,
所在直线分别为x轴、y轴、z轴,建立如图所示的空间直角坐标系.
的法向量;
(2)求平面
的法向量.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462b1c65b1b233ab98a90c164c0968c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894b409d03ba95b3c3b9b573bcb18f6a.png)
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【推荐1】如图,正三棱柱
的所有棱长均为2,点
分别为
的中点.
(1)证明:
平面
;
(2)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/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5307e04a84a0621e4d5bd2aaa1980ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/f5edf4d6-e9e7-404c-84d4-9385b204f5fd.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7d857811cbd619f868d951aa7a0ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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【推荐2】已知三棱柱
,
,侧面
为矩形,面
面
.
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761063105978368/2762750065115136/STEM/a3565cec-9e6d-45cc-a498-0e24e980763a.png?resizew=281)
(1)求证:
;
(2)若二面角
的余弦值为
,
为
中点,求
与面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ddc3178cc8ac2e034fe3b1723b4bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761063105978368/2762750065115136/STEM/a3565cec-9e6d-45cc-a498-0e24e980763a.png?resizew=281)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b872d508016940c461cd7880c88b7f.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90c86be02bec7e9604c93233fd482de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24006d28116bc097933cc90bcc0ea69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8550fbd7938e0d8639462ac52a6dad1f.png)
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