如图,在四棱锥
中,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/735bd628-ab6f-4d1f-bdaa-18f22663dc04.png?resizew=190)
(1)求直线
与平面
所成角的正弦值;
(2)在线段
上,是否存在一点
,使得平面
平面
?如果存在,求此时
的值;如果不存在,说明理由.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72a4d999231f9af00770510203084b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/735bd628-ab6f-4d1f-bdaa-18f22663dc04.png?resizew=190)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9332d230f25309248ff2a6161f060229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b1715e43d4ca66f32ac9b56fe426fc.png)
更新时间:2022-11-08 09:38:23
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知四边形
为直角梯形,
,
为等腰直角三角形,平面
平面
为
的中点,
.
平面
;
(2)求
与平面
所成角的正弦值.
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdb57d8e4041a23abe672105716e587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d11e19c84255eb0431415c2dec553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99431b9cc5b5c487894efaed5500593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/816b7f285cc55bbe5bf873538ba87230.png)
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解题方法
【推荐2】如图,在正四棱柱ABCD-A1B1C1D1中,AA1=2AB,E、F分别为AA1、AC的中点.
(1)求证:EF∥平面CDA1B1;
(2)求EF与平面DBB1D1夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/439bde18-2a8f-4c0e-95eb-d9b5d082495b.png?resizew=113)
(1)求证:EF∥平面CDA1B1;
(2)求EF与平面DBB1D1夹角的余弦值.
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解答题-证明题
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【推荐1】如图,平面
平面
,
是以
为斜边的等腰直角三角形,
分别为
,
,
的中点,
,
.
(I)设
是
的中点,证明:
平面
;
(II)证明:在
内存在一点
,使
平面
,并求点
到
,
的距离.
![](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/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f0c24183d99c180c30d8f545aa7365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747b3c0eb656c2a9f69c93fbd77d4db4.png)
(I)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a779876cdfb2c489ad0eaed0f73e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f92c5ae6d8df4bf91d9ba6664b26b9.png)
(II)证明:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12cfce6bedc9e8962a4a8b9afce4d4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf36ebd7da84a986eede6c29ff65dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f92c5ae6d8df4bf91d9ba6664b26b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/a0c7ba05-b098-4ad5-84b0-0332c3a4580e.png?resizew=174)
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解答题-问答题
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解题方法
【推荐2】如图,在四棱柱ABCDA1B1C1D1中,底面ABCD是平行四边形,E,F,G分别是A1D1,D1D,D1C1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/4ffa9c6e-c20b-4253-bab7-c050c7797405.png?resizew=203)
(1)试用向量
,
,
表示
;
(2)用向量方法证明平面EFG
平面AB1C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/4ffa9c6e-c20b-4253-bab7-c050c7797405.png?resizew=203)
(1)试用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228f4ddbb8959f904d71259be7c6ab36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d0ed5745ba16ce0dd9c04e90352411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b1ee3217b5a9e19488f4b98fd36c9f.png)
(2)用向量方法证明平面EFG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
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解答题-问答题
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【推荐1】在如图所示的几何体中,四边形CDEF为正方形,四边形ABCD为梯形,
,
,
,
平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/82f16900-46a4-4939-9f3d-9bbad904ea90.png?resizew=188)
求BE与平面EAC所成角的正弦值;
线段BE上是否存在点M,使平面
平面DFM?若存在,求
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5408641691fd27f6dd8cf0ab2043ad4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc185bb09a17c629c37ee7104682b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c7ad9191570e902ba80a60af2f29dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fab4d2a8ab12be628eb2ce03f0ae7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/82f16900-46a4-4939-9f3d-9bbad904ea90.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffabc5db23a96ca6dec509f28c9b4d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3c695f3429909f1c51a7c14957059b.png)
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解题方法
【推荐2】如图,在正方体
中,
为
的中点.
(1)求证:
平面
.
(2)求直线
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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/0b26617d-4039-436d-86b1-1e1eea4a1a16.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd597851c0db4e4de4769e10e09383b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
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