三棱柱
中,
为
中点,
.
平面
;
(2)求
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/4f8e5d91f9c6a7ff6ca876995a221bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4aa9e1870275494a984f65b415a6c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
2023·陕西·模拟预测 查看更多[4]
陕西省菁师联盟2024届高三12月质量监测考试(老教材)文科数学试题(已下线)第17讲 第八章 立体几何初步 章末重点题型大总结-【帮课堂】(人教A版2019必修第二册)(已下线)专题8.12 立体几何初步全章综合测试卷(基础篇)-举一反三系列(人教A版2019必修第二册)(已下线)专题3.8 立体中的夹角和距离问题-重难点突破及混淆易错规避(人教A版2019必修第二册)
更新时间:2023-12-09 08:07:37
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解答题-证明题
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【推荐1】如图,在三棱台ABC﹣A1B1C1中,D,E分别是AB,AC的中点,AB=2A1B1,B1E⊥平面ABC,且∠ACB=90°.
(Ⅰ)求证:B1C∥平面A1DE;
(Ⅱ)若AC=3BC=6,△AB1C为等边三角形,求四棱锥A1﹣B1C1ED的体积.
(Ⅰ)求证:B1C∥平面A1DE;
(Ⅱ)若AC=3BC=6,△AB1C为等边三角形,求四棱锥A1﹣B1C1ED的体积.
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【推荐2】正三棱锥
的侧面与底面所成的二面角为
,相邻侧面所成的二面角为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4751cf603392fadc3f3eaed4f923bf4b.png)
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解题方法
【推荐1】如图,在四棱锥
中,侧棱
,底面
是菱形,
与
交于
点.
(Ⅰ)求证:
平面
;
(Ⅱ)若
为
中点,点
在侧面
内及其边界上运动,并保持
,试指出动点
的轨迹,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37505861cb6bd5dd3c95da992510c3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e8f350b865da747d0b90243fa1ce28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c009f663ad2b0c3ba521daf4b86b066f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2012/1/2/1570671330615296/1570671336144896/STEM/95dc458d40bf401a9713ba69898dfadf.png?resizew=190)
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解题方法
【推荐2】如图,在四棱柱
中,![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/c4228edccb414515960d21828d45abbf.png)
底面
,
,
,且
,
. 点E在棱AB上,平面
与棱
相交于点F.
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/9d4b9993e1544b6eab6598a8295fdcf4.png)
(Ⅰ)求证:
∥平面
;
(Ⅱ)求证:
平面
;
(Ⅲ)写出三棱锥
体积的取值范围. (结论不要求证明)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/5f5755abfece458e81ff8b2cea8a20e1.png)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/c4228edccb414515960d21828d45abbf.png)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/3234dbbfd3ee4b27a2137dbeec96d8e2.png)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/f9fe2cf55a5b4ee8808addcf5b8d3a9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4267947212d0604079dd7e76854dbb19.png)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/805d47f354ef4b068364fb3c92aa0877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdc0b1d129b086faf83d192decd9f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f233b375753611ffa7a93c2c12ef5e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adfcfa3dbc655af0f42d8773eb7710f.png)
![](https://img.xkw.com/dksih/QBM/2015/3/23/1572021298356224/1572021304090624/STEM/9d4b9993e1544b6eab6598a8295fdcf4.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b886daa3c9bb7153acd9f651f99eb2c1.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599b63c003aeb99d777e87182db8f019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
(Ⅲ)写出三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb2e6a3e37a38494fc4c977d0b5b4b4.png)
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【推荐1】已知几何体
中,
∥
,
,
平面
,
∥
,
,
.
(Ⅰ)求证:平面
⊥平面
;
(Ⅱ)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c045cebf23f50fa2c5489b3eeb68b226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cfb5270cfc6be37e272dea509872db.png)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(Ⅱ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2977ae4bfa32de8c6f0fb136205c4fe7.png)
![](https://img.xkw.com/dksih/QBM/2017/5/7/1681847323738112/1688349634535424/STEM/019efb2a65fa4a838a2facd6fc14bc32.png?resizew=177)
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【推荐2】如图,在长方体
中,
,
,点
是线段
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/9cc955a8-b8f8-4540-a2b0-928476f9be61.png?resizew=234)
(1)求证:
;
(2)求
点到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d64fc81c857b124268609a8beb77b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/9cc955a8-b8f8-4540-a2b0-928476f9be61.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8079b402caca88f1834ec95b6d6527.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4755dc59cb5a03cd39879bc80fdbb9.png)
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【推荐1】如图,在四棱锥
中,
平面ABCD,底面ABCD是边长为1的菱形,
,
,M是PB的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/27/2602107263516672/2603290880958464/STEM/16ef299a-9302-43a6-8cf3-576a6a9321d4.png?resizew=206)
(1)求证:
平面ACM;
(2)求直线AM与平面PBC所成角的正弦值.
![](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/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://img.xkw.com/dksih/QBM/2020/11/27/2602107263516672/2603290880958464/STEM/16ef299a-9302-43a6-8cf3-576a6a9321d4.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826bf6fa3706921b77ad0eb4fcc206bd.png)
(2)求直线AM与平面PBC所成角的正弦值.
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【推荐2】如图的多面体中,
为矩形,且
平面
,
,
为
的中点,
;
(1)求证:
平面
;
(2)求
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7022de589007f969bd5204c52bb8528d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9efe66d99f813c6b1387392186822bb.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://img.xkw.com/dksih/QBM/2018/6/11/1965125363589120/1967145675923456/STEM/69aa4dce59504e84863ac3da93fc361c.png?resizew=156)
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