如图,在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/882f8981-a3b4-461b-aabd-767ca33bd321.png?resizew=135)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值;
(3)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099edd3520292558184521a9af4e9064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d261edf9b4cfa7232e2bc184db1995.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/882f8981-a3b4-461b-aabd-767ca33bd321.png?resizew=135)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993830e5de2bbf858071d375bbf186f8.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
更新时间:2023-02-22 19:21:38
|
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】在如图所示的几何体中,四边形ABCD为正方形,
平面ABCD,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/01589478-7252-4500-ab3d-69c5809c4951.png?resizew=162)
(1)求证:
平面PAD;
(2)在棱AB上是否存在一点F,使得平面
平面PCE?如果存在,求
的值;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/726ad14426666052d714076cd60f5716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82465b63174087aeba7788ed984583d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/01589478-7252-4500-ab3d-69c5809c4951.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544381069cb72bed5598ca5adc45ae26.png)
(2)在棱AB上是否存在一点F,使得平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6dd051db98c531f9ef18cdfd793f4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
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【推荐2】如图,已知四棱柱ABCD-A1B1C1D1,AA1⊥平面ABCD,四边形ABCD是正方形,点E在线段A1D上,且A1E=2ED.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/bcee8153-0916-4138-9574-cfc41ffbca22.png?resizew=219)
(1)证明:BD1⊥AC;
(2)证明:BD1∥平面ACE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/bcee8153-0916-4138-9574-cfc41ffbca22.png?resizew=219)
(1)证明:BD1⊥AC;
(2)证明:BD1∥平面ACE.
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解答题-证明题
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解题方法
【推荐1】如图,在四棱锥
中,
底面
,底面
是正方形,
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730888454144/1570730894032896/STEM/256e8e2c5a704b59b0b46a5b023b8847.png?resizew=155)
(1)求证:
;
(2)求
与平面
所成角的正弦值;
(3)在平面
内求一点
,使
平面
,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/43d4c42112e0a22f240ce2ae432e5b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c2013527c6089d7df59bca21a4598c.png)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730888454144/1570730894032896/STEM/256e8e2c5a704b59b0b46a5b023b8847.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36148e5b0d89ba45bd98b91da00bf2b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
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解题方法
【推荐2】如图,在正三棱柱
中,D为棱
上的点,E,F,G分别为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/4/10/2955351166828544/2956600535097344/STEM/3e2162394d0a4cd0a4c8c73fa1268525.png?resizew=191)
(1)求证:
;
(2)求直线
与平面
所成角的大小;
(3)若
平面
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a900a979b60a859ea7c538f074e084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9d5815dc775d5a5810fff0b016a8d5.png)
![](https://img.xkw.com/dksih/QBM/2022/4/10/2955351166828544/2956600535097344/STEM/3e2162394d0a4cd0a4c8c73fa1268525.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce1335e489c2b0835d7e16ea765e1e9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60d66204e1abc17bd01749f187f8050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e59b1f7689bff6644bfdeb9e36feb163.png)
您最近一年使用:0次
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【推荐3】如图,在四棱锥
中,底面
为直角梯形,
,
,
,
,
,点
、
分别为
,
的中点,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/5c1cc4db-c205-4371-835c-e4935a4382a5.png?resizew=190)
(1)求证:
平面
.
(2)若
,求直线
与平面
所成角的正弦值.
![](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/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/5c1cc4db-c205-4371-835c-e4935a4382a5.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0255daf5b7e63473f69c1aa69c0a83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af16d12b3ff56cc7cbc545ee45580789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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解题方法
【推荐1】如图,在长方体
中,
,
,点E在棱AB上移动.AE为何值时,二面角
的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d64fc81c857b124268609a8beb77b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35988677892d6ffdf4773f7a861f26a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/ed1a64af-b6c0-4ecc-8574-05a4122ed217.png?resizew=178)
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【推荐2】如图,正方体
的顶点坐标为
,
,
,
,
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b32ab04dd852329d5918b177c199eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2755d7f7751444a6ee6de623bdd836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8978311495c4dcc0a65bc0a6c8e4c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652901d0cbdc66440cd2ffd9b1cb1aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bccc7e67287262fb97425087c2e58c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9d592b215b93db39ba2478969038cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ceb31247add8ca7b0853e801e1d125.png)
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【推荐3】如图,在三棱柱
中,已知
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572947995525120/1572948001923072/STEM/5410321d53d8407490931ae9ec6ca9f7.png?resizew=266)
(1)证明:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9f99fb3252a4b3b7a62e8a675ddce9.png)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572947995525120/1572948001923072/STEM/5410321d53d8407490931ae9ec6ca9f7.png?resizew=266)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870cee007535b979d35bc7feab75616.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f37656e410b600bc0019570dd16fb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238c0f26c7f3a364a85d417494490527.png)
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