如图,
且
,
,
且
,
且
,
平面
,
.
(1)若M为CF的中点,N为EG的中点,求证:
平面
;
(2)求二面角
的余弦值;
(3)若点P在线段DG上,且直线BP与平面
所成的角为
,求线段DP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc143c7fd7c471ca91b6ccc22438fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66514e4d9ad91dbc0cc4330de68a29e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee573ad62dc536a05dadf5008f1afb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755d575f0a87f3345e232b66d5956070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cf187bc2ede965870b90757b495f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b091ee5a8b32424b2b836dde7860c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/49e0f005-4891-4a18-8cfa-75ae83f0386b.png?resizew=167)
(1)若M为CF的中点,N为EG的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8d99c75180422fecf6d3f3d2910b34.png)
(3)若点P在线段DG上,且直线BP与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cfd99a702ee24f9ef94e4b6f50101f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
更新时间:2023-10-17 11:49:26
|
相似题推荐
解答题-证明题
|
适中
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名校
【推荐1】如图,在四棱锥
中,
平面
,
,四边形
满足
,
,
,点
为
中点,点
为
边上的动点,且
.
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545350606962688/2548258085314560/STEM/22549e0122ab4814a5cfdc2f9382db92.png?resizew=244)
(1)求证:
平面
.
(2)求证:平面
平面
.
(3)是否存在实数
,使得二面角
的余弦值为
?若存在,试求出实数
的值;若不存在,说明理由.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b72c6d2ae4924f930c437542b3356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9e381b946bbffe235b59bedb7d9902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](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/537f007215286bb97a3f23b2f1617608.png)
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545350606962688/2548258085314560/STEM/22549e0122ab4814a5cfdc2f9382db92.png?resizew=244)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba8f7af0e091e082100c3cd7f8c487f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c7a28689896cc033a327f899a79544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】如图,在长方体
中,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/835c54eb-fdee-41c7-8b30-5f12c8c6854b.png?resizew=187)
(1)求证:
.
(2)在棱
上是否存在一点
,使得
平面
.若存在,求
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f5dd01b683fcab010fc6ff5558c9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/835c54eb-fdee-41c7-8b30-5f12c8c6854b.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bed57f36afefe6c0163c0500fc3be9.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf9403ecd2ae90269297499ba6c7182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503be2b7feae04f09c329dd3cd8ee58c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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解题方法
【推荐1】如图,在圆锥
中,
是底面圆的直径,
,
是底面圆周上一点,
与平面
所成的角为30°,点
,
分别在
,
上,且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/87b9b52f-3ced-4697-8775-5fffc66406cc.png?resizew=192)
(1)求
的值;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/87b9b52f-3ced-4697-8775-5fffc66406cc.png?resizew=192)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cafe199913787a939fe9e100924023.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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【推荐2】如图,在空间几何体
中,
均为正三角形,且平面
平面
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/9cbfcd2c-479e-4c1c-8ccc-02b1118bb0d2.png?resizew=143)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
平面
;
(2)
是棱
上的一点,当
与平面
所成角为
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0b9ab02cb88c54ca586dfff79ed1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14172212b7b34eaf967c5a72233621c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/9cbfcd2c-479e-4c1c-8ccc-02b1118bb0d2.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399d731913a563e291b817831a0c678.png)
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【推荐3】如图,在平面四边形
中,
,
,且
,以
为折痕把
和
向上折起,使点A到达点E的位置,点C到达点F的位置(E,F不重合).
![](https://img.xkw.com/dksih/QBM/2022/10/15/3088420423360512/3094183877058560/STEM/953c8464ed13466d8222c7276114ade3.png?resizew=297)
(1)求证:
;
(2)若平面
平面FBD,点G为
的重心,
平面ABD,且直线EF与平面FBD所成角为60°,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974e32fac0b8857d855464877fa071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc73a32a9c53743ea69d2cc053bce74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c419c59e84ff9a14f86761893b56e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe70c6135cb07a6c93b274322ee3833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f923edfaa4032757d8a8e65ddda236.png)
![](https://img.xkw.com/dksih/QBM/2022/10/15/3088420423360512/3094183877058560/STEM/953c8464ed13466d8222c7276114ade3.png?resizew=297)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b810d861639a51301b15edef0c29f2.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87efa782d2cde5cb35c28a3b80bc5a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe70c6135cb07a6c93b274322ee3833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be7ec67c252f349fe8c35bc6a2be537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1671565f167abe03cc0c4dd16b86d2.png)
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【推荐1】如图,已知
中,
,
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a6d42741c7efe437d3af509ed7d569.png)
是
的中点.
![](https://img.xkw.com/dksih/QBM/2014/11/18/1571897601064960/1571897606979584/STEM/186496dabc3a4f1c91515925fa11fa8d.png)
(Ⅰ)若
是
的中点,求证:平面
平面
;
(Ⅱ)若
,求平面
与平面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0fe7a934cca2a64cfdab0a37112368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f6152ad24a712c31e851d1ee6eb47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbe3ec31a79a171dcf274ff99e50762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a6d42741c7efe437d3af509ed7d569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b6b8f942fadb5961ffa1fe152e695f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2014/11/18/1571897601064960/1571897606979584/STEM/186496dabc3a4f1c91515925fa11fa8d.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84660017c064bb45bb8cd11eda3bac28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9839448fd9fc1777c0638195d26a78d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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【推荐2】如图,在三棱锥P-ABC中,PA⊥底面ABC,△ABC是直角三角形,且PA=AB=AC.又平面QBC垂直于底面ABC.
(1)求证:PA∥平面QBC;
(2)若PQ⊥平面QBC,求锐二面角Q-PB-A的余弦值.
(1)求证:PA∥平面QBC;
(2)若PQ⊥平面QBC,求锐二面角Q-PB-A的余弦值.
![](https://img.xkw.com/dksih/QBM/2018/9/20/2036302316167168/2050079802662912/STEM/f64b74f3a5934e1798a5bc0bdfa20848.png?resizew=101)
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【推荐3】如图,在四棱锥
中,
底面
,底面
为直角梯形,
,
,
,
为
的中点,平面
交
于
点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/9d5d256b-22e7-464c-b01d-cb528a6e9cb6.png?resizew=148)
(1)求证:
;
(2)求二面角
的余弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf7488ccaf26541626131bceb8f1069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/9d5d256b-22e7-464c-b01d-cb528a6e9cb6.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b923fc579eb1e093834f3960442d963d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf4e39606a2fe55626e9ae3486e92f3.png)
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