如图1,在等腰梯形
中,
,
,将
沿
折起到
的位置,使二面角
成直二面角,连接
,
(如图2)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/094f53d1-4a1c-4a6f-b2c6-b20f9a481a50.png?resizew=356)
(1)求证:
;
(2)若
,求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c4f50099e8471653b1be8954421887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfdd37076cae1b5180264b72729faf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c597ff77c65c5add6f50294e3eee9536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/094f53d1-4a1c-4a6f-b2c6-b20f9a481a50.png?resizew=356)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a905fb10e861a2e631958fc05c1b923.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4277c33b1f868405fbeb493184e48742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96872cd6cd581ae8a861c7032e0257b4.png)
更新时间:2018-04-07 17:38:46
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,四棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/172659ee-de7a-4297-8949-9ad1a8bfb417.png?resizew=188)
(1)求证:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32bfed41bf1674822a9c7ca82105788c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab8dd48fd4f50850fa87a5d80287a22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/172659ee-de7a-4297-8949-9ad1a8bfb417.png?resizew=188)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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【推荐2】如图,
是圆的直径,
垂直圆所在的平面,
是圆上的点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bbdfbf6ae5a249ffb14c3b793ace35d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/7b60ce36-6236-4be1-96c5-c0fd98abc183.png?resizew=171)
(1)求二面角
的大小;
(2)求点
到平面
的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bbdfbf6ae5a249ffb14c3b793ace35d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/7b60ce36-6236-4be1-96c5-c0fd98abc183.png?resizew=171)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a2fd95dfda3f70bc2d9fcd8380bf99.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
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适中
(0.65)
解题方法
【推荐1】如图,在直三棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/d3af5aff-0049-4752-be04-950d6cb43aeb.png?resizew=179)
(1)证明:
.
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3be3dcde7b744f420a588cb8dd5b01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/d3af5aff-0049-4752-be04-950d6cb43aeb.png?resizew=179)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e5dc81fbafbe58bff0842f7776d80a.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3120955852eb060caf374eb031adca8.png)
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【推荐2】如图,
是圆柱底面的内接三角形,
为圆柱的母线,其中
,圆柱的母线和其底面圆直径的长都为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/d3134882-ca1e-4ce8-a781-2cb83d18813b.png?resizew=126)
(1)当
时,证明:
;
(2)当三棱锥
体积最大值时,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2a8d0c77c54fdf9aa97978f8e5dc0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/d3134882-ca1e-4ce8-a781-2cb83d18813b.png?resizew=126)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
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【推荐3】如图,在四棱锥
中,四边形
为直角梯形,
,
,E为
的中点,
,
,且
为正三角形.
(1)证明:
.
(2)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/151adae7bf60f109d3f275fd9fd4e5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174471d56bb8989b12bfc03ef74d54cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2d5ab801f2a84b78139b0ea2c5032b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/476b689d-0f1f-4e3d-b673-2e80cc383ee6.png?resizew=219)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7767186dae5486fe4ca50359185c0b0.png)
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解题方法
【推荐1】如图,在四棱锥
中,
,
,
,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2022/7/12/3021096910823424/3022900065009664/STEM/b097e059e4f64abd99219ff26eafcf98.png?resizew=226)
(1)求证:
;
(2)若直线
与平面
所成角的为
,求直线
与直线
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625bca170fed3fbdc1441b3c0df4a6bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d730ae4307db56b47849c3a19dedfb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b85c51162539939ebdbaf8ff3749eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/7/12/3021096910823424/3022900065009664/STEM/b097e059e4f64abd99219ff26eafcf98.png?resizew=226)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图①,在直角梯形ABCD中,∠ADC=90°,CD∥AB,AB=2,AD=CD=1.将△ADC沿AC折起,使平面ADC⊥平面ABC,如图②,求证:BC⊥AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2151b1aa-f14f-48e1-a2a4-b8d941bbf4f7.png?resizew=324)
您最近一年使用:0次