如图所示的几何体
中,
平面
,
,
,
,
为
的中点,
,
为
的中点.
(1)求证:
//平面
;
(2)求点
到平面
的距离.
(3)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd654221ab95fe241d9e0202443f2609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62871bb0dff211fc3bd80f9066c25b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b6ab5352535496210b57b7bd73876b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fb8a8db06122b73821cb3838e7a578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bb8ab7c2b4e68bae55828bcf240d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8e8f8b75e657565fe628d869b0bde3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/8a4ce056-6efc-4b60-9ae2-50ef6608c33d.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
更新时间:2024-02-03 14:11:30
|
相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】如图所示,正方体
中,M、N、E、F分别是棱
,
,
,
的中点,用空间向量方法证明:平面AMN∥平面EFDB.
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/dbdcc4b02f504570a0d4f5ba9b8f02c2.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/a55a6a8da9a1492fa1a0e681b0f9f6b6.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/5d37202718874399bfe8835b64012dba.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/927ebc63aa0c4a279a13fc9b742a8578.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/7f7cf1909dd84281b1bda4796f488a96.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572477726941184/1572477733052416/STEM/fb0bb2c76d8944a9b7cfa4121cfb3f77.png?resizew=144)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】在四棱锥
中,底面
是正方形,侧面
是正三角形,平面
底面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/47802d0e-3bda-4981-8bf0-aa17c6802a46.png?resizew=212)
(1)证明
平面
.
(2)求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c04c251140836bddf638b36de537c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00acc724bbb4569974d4775675a6fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/47802d0e-3bda-4981-8bf0-aa17c6802a46.png?resizew=212)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c04c251140836bddf638b36de537c21.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c04c251140836bddf638b36de537c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38493705397b4c1e7dc7706baa4f2f48.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】如图,四棱锥
中,平面SAD
平面SAB,BC
SA,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/4/1959869297360896/1959889672871936/STEM/1f767fd95a9e40e99823fbb0c6cb625a.png?resizew=235)
(1)证明:在线段
上是否存在点
,使得
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58ece8dc5f29476a20d1de282116ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1bed9e7cd7aa41d0cb0f9fc1ec5eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://img.xkw.com/dksih/QBM/2018/6/4/1959869297360896/1959889672871936/STEM/1f767fd95a9e40e99823fbb0c6cb625a.png?resizew=235)
(1)证明:在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b3b18b7f7e08f195bcdf3acfffff3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf861f488b5ff71135081f1524fdd5e.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图所示,已知
是正三角形,若
平面
,平面
平面
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c805af04-0799-4b61-ada2-0af69998793f.png?resizew=169)
(1)求证:
平面
;
(2)若
平面
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf7c14f4ecf33ee9938a76c3ac45d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad01edc5d969ef89c350b5614c386db9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c805af04-0799-4b61-ada2-0af69998793f.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee188333e1fa99417aede565c6a4a136.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b61346bd4091070ba84a4046f87f365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee188333e1fa99417aede565c6a4a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8465ae5987fcd9ff42b11da3614a8b47.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】瀑布(图1)是埃舍尔为人所知的作品.画面两座高塔各有一个几何体,左塔上方是著名的“三立方体合体”(图2).在棱长为2的正方体
中建立如图3所示的空间直角坐标系(原点O为该正方体的中心,x,y,
轴均垂直该正方体的面),将该正方体分别绕着x轴,y轴,
轴旋转45°,得到三个正方体
,
(图4,5,6)结合在一起便可得到一个高度对称的“三立方体合体”(图7).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e3b361ab-bbcd-4ec1-8d7e-a51250337d2a.png?resizew=324)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/0bb32dad-7e15-4145-bd9e-7b88d7c08cd4.png?resizew=666)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/cbcb0d91-53de-4cc9-8883-d5af9ffe1571.png?resizew=486)
(1)设
,求
,
.
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ecd73870da15600dfdc2220693fd81b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750335e0a1896eb270407e86335a85a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e3b361ab-bbcd-4ec1-8d7e-a51250337d2a.png?resizew=324)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/0bb32dad-7e15-4145-bd9e-7b88d7c08cd4.png?resizew=666)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/cbcb0d91-53de-4cc9-8883-d5af9ffe1571.png?resizew=486)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb7fd30eee48d581e5d812c2e10aa11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fabf4c9a84e0b9690c7248a6f733f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750335e0a1896eb270407e86335a85a2.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c61c8e532d25d239382c40490905e7.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在正四棱柱
中,已知
,三棱锥
的体积为
.
(1)求点
到平面
的距离;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c224b2f296216e50a38cd465ea1077d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/839ba7f3-9231-4f3f-acf2-2e3dae98f802.png?resizew=164)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
您最近一年使用:0次