如图1,在直角梯形中,
,
,
,
是
的中点,
与
交于
点,将
沿
向上折起,得到图2的四棱锥
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00cb953004dcb6e4dd6880e8be5202c6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db51de0d0a68d4c12787cf3ee1609205.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17ae0eaea601d6b62be05cfce86c5ca.png)
22-23高一下·河北唐山·期末 查看更多[2]
更新时间:2023-07-14 09:54:20
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相似题推荐
解答题-问答题
|
较难
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名校
【推荐1】如图,直四棱柱
的底面
是菱形,
是
的中点,
为线段
上一点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/fe857464-e59e-40b7-97e8-308f734aae33.png?resizew=180)
(1)证明:当
时,
平面
;
(2)是否存在点
,使二面角
的余弦值为
?若存在,请指出点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/fe857464-e59e-40b7-97e8-308f734aae33.png?resizew=180)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c114237f609956017bc72f4971d5b375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31d79927f9b7d0e911af5571e660575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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解题方法
【推荐2】在四棱锥
中,四边形
是边长为2的菱形,
为正三角形,
与平面
所成的角为
,平面
平面
.
(1)求证:
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4cd8ba7eb52e38857830162e770f534.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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解题方法
【推荐3】在四棱锥
中,平面
底面
,
,
,
平分
,
为
的中点,
,
,
,
,
分别为
上一点,且
∥
.
(1)若
,证明:
∥平面
.
(2)过点
作平面
的垂线,垂足为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeadd146662b5d8fe14a424138ef751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5adc18ca424552b35ab939e9d57943e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56afb8c84a2105d525b84b6862a5426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927e3bd9751cc4abd2e0cc50827099bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52375d68f3632452807c51d6040ada0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73153657848013d2a1c3247d7f84ddeb.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244c485406cca45c4290b1320bf8ce90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/64f71ae1-d307-45b5-90a7-2ff426978aeb.png?resizew=204)
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【推荐1】如图,四边形ABCD中,
,
,
,沿对角线AC将△ACD翻折成△
,使得
.
![](https://img.xkw.com/dksih/QBM/2022/1/25/2902134728515584/2912131593936896/STEM/72efb4e12cbe48bb90d229c3333e942b.png?resizew=201)
![](https://img.xkw.com/dksih/QBM/2022/1/25/2902134728515584/2912131593936896/STEM/d64ab1614a2a47c29724eb75d09f43f0.png?resizew=199)
(1)证明:
;
(2)若
为等边三角形,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb3e724d5ebb26d9f4ffa41ab8c9ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7f89fd7ddc3277cf27230a12d60f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f921b462ee12ad5749ea45d75f609b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740814b7d5ceadf71fc7761a0a38273a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/25/2902134728515584/2912131593936896/STEM/72efb4e12cbe48bb90d229c3333e942b.png?resizew=201)
![](https://img.xkw.com/dksih/QBM/2022/1/25/2902134728515584/2912131593936896/STEM/d64ab1614a2a47c29724eb75d09f43f0.png?resizew=199)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d274cdceee1b0ecbd65a37ebf40f004.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc7ef860f69c3473d7832a01765aaf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd606081fe85a262777717651cabb82.png)
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【推荐2】如图,在圆锥
中,已知
,⊙O的直径
,点C在底面圆周上,且
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/6f722fc3-36e5-4538-b282-3cbbbb372a78.png?resizew=126)
(1)证明:
平面
;
(2)证明:平面
平面
;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e89e99ab9c1ece0cc5c3bbabaa97de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170afcc07134e3f5b89bccc1a3792d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/6f722fc3-36e5-4538-b282-3cbbbb372a78.png?resizew=126)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6748d9b9948485c5ba87ca8751c6e053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15b63176f43bc7a0654d0f6f45e7429.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505a3a76add321e8ddf14c0d7250cdb6.png)
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【推荐1】如图所示,四边形
为正方形,四边形
,
为两个全等的等腰梯形,
,
,
,
.
(1)当点
为线段
的中点时,求证:
;
(2)当点
在线段
上时(包含端点),求平面
和平面
的夹角的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b578af6297446dfbf9fd7924b75adaef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/32f66264-5281-403e-b4af-837f4af4181a.png?resizew=166)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415adf8f49b22229ab2511dbd30c704c.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1fb7cb45ec3d67bfb57bbf5b023662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
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【推荐2】如图,在四棱锥
中,已知
平面
,且四边形
为直角梯形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/cbc8925c-378a-42bd-b2d2-a2ea44747bbb.jpg?resizew=178)
(1)证明:
;
(2)求平面
与平面
所成锐二面角的余弦值;
(3)点
是线段
上的动点,当直线
与
所成的角最小时,求线段
的长.
![](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/a8d3947804a878a87052c266be475423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/cbc8925c-378a-42bd-b2d2-a2ea44747bbb.jpg?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
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