如图,扇形AOB的半径为2,圆心角∠AOB=120°.PO⊥平面AOB,PO=
,点C为弧AB上一点,点M在线段PB上,BM=2MP,且PA
平面MOC,AB与OC相交于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/f087798f-066b-4d2f-b68e-d07d1e661eea.png?resizew=154)
(1)求证:平面MOC⊥平面POB;
(2)求平面POA与平面MOC所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/f087798f-066b-4d2f-b68e-d07d1e661eea.png?resizew=154)
(1)求证:平面MOC⊥平面POB;
(2)求平面POA与平面MOC所成二面角的正弦值.
2019高三下·全国·专题练习 查看更多[9]
(已下线)2019年5月2019届高三第三次全国大联考(新课标Ⅰ卷)-理科数学山东省日照市2019-2020学年高三下学期1月校际联考数学试题(已下线)备战2020年高考数学之考场再现(山东专版)02(已下线)2020年秋季高三数学开学摸底考试卷(新高考)04(已下线)黄金卷04 【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(广东专用)宁夏银川一中2021届高三下学期返校测试数学(理)试题河北省石家庄市藁城新冀明中学2020-2021学年高二上学期12月月考数学试题河南省豫北名校联盟2022届高三下学期第三次模拟考试理科数学试题四川省仁寿县铧强中学2024届高三上学期9月诊断性考试理科数学试题
更新时间:2022-05-17 19:50:56
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解题方法
【推荐1】如图所示的多面体ABCDEF满足:正方形ABCD与正三角形FBC所在的两个平面互相垂直,FB∥AE且FB=2EA.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5a829407-5d6d-47eb-951a-8857602c4d46.png?resizew=167)
(1)证明:平面EFD⊥平面ABFE;
(2)求二面角E﹣FD﹣C的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5a829407-5d6d-47eb-951a-8857602c4d46.png?resizew=167)
(1)证明:平面EFD⊥平面ABFE;
(2)求二面角E﹣FD﹣C的余弦值.
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【推荐2】如图,斜三棱柱
中,平面
平面
,
为棱
的中点,
与
点
.若
,
60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/dc5d0e57-b297-4547-b9a5-a2cf0fc5c389.png?resizew=264)
(Ⅰ)证明:直线
平面
;
(Ⅱ)证明:平面
平面
;
(Ⅲ)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/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d1a93dd42f32815f2ca2e126612623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765ed8ef8bd23caece9652f5e1a547fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/dc5d0e57-b297-4547-b9a5-a2cf0fc5c389.png?resizew=264)
(Ⅰ)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af142a6050b54e8b5777a085d4597481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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【推荐1】如图,在四面体
中,
,平面
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94117be6898f465b621b00d996cea62a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/56ffbb5b-b88f-4c45-ba34-22b9b5c428c2.png?resizew=168)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a916d31a199e250556fb7478d9f57f7.png)
(2)若二面角
的余弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e588d344b5ea3f8069ea54a631db20.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/editorImg/2024/3/5/56ffbb5b-b88f-4c45-ba34-22b9b5c428c2.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a916d31a199e250556fb7478d9f57f7.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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【推荐2】如图,在四棱锥
中,
底面
,
,
,
,
,
为
上一点,且
.请用空间向量知识解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/2/18/2919254438658048/2935369113346048/STEM/582ca86e-5cc4-4ffe-b9de-548e13b09008.png?resizew=155)
(1)求证:
平面
;
(2)求平面
与平面
夹角的大小.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30f6595dd643813b11ad71df61a10dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536a2be7b84612f45cc875a00c5a5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b05f661421735de6c6a643f83c6ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3ad276e6b32bd203fdacb42b1fe6d7.png)
![](https://img.xkw.com/dksih/QBM/2022/2/18/2919254438658048/2935369113346048/STEM/582ca86e-5cc4-4ffe-b9de-548e13b09008.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
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