如图,PCBM是直角梯形,
,
,
,
,又
,
,
,且直线AM与直线PC所成的角为60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7570a4f4-1491-4131-8a14-b1c240b1e7d3.png?resizew=244)
(1)求证:平面PAC⊥平面ABC;
(2)求异面直线PA与MB所成角的余弦值;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8432a44f6c6b37f4961dc63521fa7f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3624d307a5482ff913eb8d608d827077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dca0fddd44a2a325754baf9452fe90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7570a4f4-1491-4131-8a14-b1c240b1e7d3.png?resizew=244)
(1)求证:平面PAC⊥平面ABC;
(2)求异面直线PA与MB所成角的余弦值;
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142ea3931dc45cfe66b66ef17d3cefcd.png)
更新时间:2022-12-04 17:46:46
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知直三棱柱
中,
是线段
的中点,连接
,得到的图形如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/dd7315fe-0721-4de3-bc39-afe471cc0648.png?resizew=194)
(1)证明:
平面
;
(2)若
,求三棱锥
的侧面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8cbe18f376a70f9f5135cac2461c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f711f0bfbeeea4109daefc2279e93a26.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/dd7315fe-0721-4de3-bc39-afe471cc0648.png?resizew=194)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ee9b78c4c1496c6c8fda568365c900.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知四棱锥
的底面为直角梯形且
,
,
垂足为
,
是四棱锥
的高,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/2f4a64e7-ca0f-4a8b-a95c-8a2ab1148824.png?resizew=158)
(1)求证:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f13a3501842b34846dcfed1ba47cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d2a86d88048b030190eb9a25156f583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5064f5ce5ac8428e277fd578da84ec6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/2f4a64e7-ca0f-4a8b-a95c-8a2ab1148824.png?resizew=158)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
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解答题-问答题
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名校
【推荐1】如图,已知正三棱柱
中,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/3fdd15a3-3dd8-495a-8429-577aad4d8cde.png?resizew=145)
(1)求四面体
的体积;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cabc3303519ac16fc998913ad9f349c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/3fdd15a3-3dd8-495a-8429-577aad4d8cde.png?resizew=145)
(1)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c775ecd6c8da7a3d6f458aa2654ced2.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
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【推荐2】如图,正方体
的棱长为2,点
为面
的对角线
的中点.
平面
交
于点
,
于点
.
![](https://img.xkw.com/dksih/QBM/2017/11/5/1810502692290560/1810933255675904/STEM/e09b2b58988c44c387ef0783e0680b60.png?resizew=186)
(1)求异面直线
与
所成角的大小;(结果用反三角函数值表示)
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7442b64b37f685bc3ae88ff450c1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2017/11/5/1810502692290560/1810933255675904/STEM/e09b2b58988c44c387ef0783e0680b60.png?resizew=186)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543c3b2beb11fbc94d66570bfbed3ea8.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】在四棱锥
中,底面
是矩形,
平面
,
,
,线段
的中点为
,点
为
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2021/10/11/2826991532228608/2827553409990656/STEM/380c8f5137f4454bbfb9d1e75dd949ad.png?resizew=239)
(1)求证:平面
⊥平面
;
(2)求二面角
平面角的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d3d97021a64f7a2ff5136f0836992c.png)
![](https://img.xkw.com/dksih/QBM/2021/10/11/2826991532228608/2827553409990656/STEM/380c8f5137f4454bbfb9d1e75dd949ad.png?resizew=239)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a7841fca64062a1f2112de9e696921.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】在四棱锥
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/512d8dcf-88aa-4e37-91a6-b999c93438bb.png?resizew=226)
(1)证明:平面
平面
;
(2)在线段
上是否存在点
,使得二面角
的大小为
?若存在,求
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/70cdcd58ea511a6fbfb0a6fb79543259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/512d8dcf-88aa-4e37-91a6-b999c93438bb.png?resizew=226)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdb4d2887b6a3594e8a710b5969cd7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b505e0df1131e3a93fc81d13f6e224e7.png)
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