如图,在边长为
的菱形
中,
,点
,
分别是边
,
的中点,
.沿
将△
翻折到△
,连接
,得到如图的五棱锥
,且
.
![](https://img.xkw.com/dksih/QBM/2015/4/1/1572058689798144/1572058695368704/STEM/4b3c1e3435c847b8a5d26f8d48f8fbf0.png?resizew=437)
(1)求证:
平面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3f4f259d60ade01bd9bf6632238e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53adfda9881851ffcab475537f8165e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b99271fe84300da304205280de1b63e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafd8ea63ced193942ba59fcb24ae73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dcba0c73b994832543511e2a1681ad.png)
![](https://img.xkw.com/dksih/QBM/2015/4/1/1572058689798144/1572058695368704/STEM/4b3c1e3435c847b8a5d26f8d48f8fbf0.png?resizew=437)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83efd6afec2f73c52e4b027a12d9f817.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a43c429d2676774d09e2509d9e26a0d.png)
2015·广东广州·一模 查看更多[9]
更新时间:2016-12-04 13:10:49
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,四棱锥
中,
平面ABCD,
,
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/d19abff9-1088-4a12-94a0-9ba582afc173.png?resizew=162)
(1)求三棱锥
的体积;
(2)求异面直线PC与AB所成角的大小(结果用反三角函数值表示).
![](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/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e21b9210b503c2dc8efb9444375f45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/d19abff9-1088-4a12-94a0-9ba582afc173.png?resizew=162)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
(2)求异面直线PC与AB所成角的大小(结果用反三角函数值表示).
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【推荐2】如图所示的正四棱柱
的底面边长为1,侧棱
,点E在棱
上,且
.
(1)求三棱锥
的体积;
(2)求异面直线
与
所成角的大小.(结果用反三角函数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9420a8e521833dd7bede07914962b15f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/607882a7-dd21-4039-924a-509a6dbbcecc.png?resizew=128)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394b5e2e3f03d2d243aede075d332e9e.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
您最近一年使用:0次
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解题方法
【推荐1】如图,已知四棱锥
,平面
平面
,四边形
是菱形,
是等边三角形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/d06bfd58-6e2c-4818-b1a0-75834877c894.png?resizew=160)
(1)证明:
;
(2)设点
在棱
上,且
,若点
到平面
的距离为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b22e2a74105e80896c441d940d08540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/d06bfd58-6e2c-4818-b1a0-75834877c894.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8337d3e8670a9ed0165ac853b80af3d9.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bd4a9f643fa884165947866a05b0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】如图,在四棱锥P-ABCD中,平面
平面ABCD,PA=PD,
,
,AD=CD=2,AB=3,E是棱AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/080cffce-e033-4c60-b855-93295692faf0.png?resizew=165)
(1)证明:
平面PCE;
(2)若
,求平面PCE与平面PAB所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/080cffce-e033-4c60-b855-93295692faf0.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ad66112b09c909cab417085702ec00.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐3】如图,在直棱柱
中, 底面
是菱形,
,
,
,E,F分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2023/6/8/3255114547724288/3259720656093184/STEM/060291902533465bbdcc47ca07d86ae1.png?resizew=241)
(1)求证:
;
(2)求证:
平面
;
(3)若平面
⊥平面
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](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/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666dc2a5188fa45948bb6e772685ac1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93fa937325f9d083ac2d059cae553c5.png)
![](https://img.xkw.com/dksih/QBM/2023/6/8/3255114547724288/3259720656093184/STEM/060291902533465bbdcc47ca07d86ae1.png?resizew=241)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(3)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a148a5584e41408fc74f8bd386b5b8.png)
您最近一年使用:0次