如图,四棱锥
的底面为直角梯形,
,
底面
,平面
平面
,点
在棱
上,且
.
(1)证明:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930b00adff64cd5f010077f0f1d78463.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/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2098dcf1922a01d16e404749d1c395c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/fc616052-c47a-4e9e-808e-9ac8d5124c2c.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1636b4530c0b42d0e0b649e90e3b9e85.png)
更新时间:2023-07-12 14:20:18
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在四棱锥
中,
底面
平分
为
的中点,
,
分别为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/ffcef358-40bd-4edf-af50-598790620023.png?resizew=188)
(1)求
的值,使得
平面
;
(2)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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d899bc757d27b6f91aa0552300cf3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c0229a9dcb5c3fa67be5ecf0955cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2798b9dc61befbbf3f0e9c95b5e2e4.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/4b7e7e42ef653d2d6284c032df57c06b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/ffcef358-40bd-4edf-af50-598790620023.png?resizew=188)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50be91c830e77f021b650d0ce9d9c84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73153657848013d2a1c3247d7f84ddeb.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73153657848013d2a1c3247d7f84ddeb.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图所示,四棱锥
中,底面
与
交于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ce72a17d424da3929db78d7b356bb4.png)
且
,点
为线段
上靠近
的三等分点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a955fdf63cd3c967a7f3837a0462dc86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ce72a17d424da3929db78d7b356bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7902ea59bdb43c87c821dcad35ff390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6f25abcc01b0cbbc157373f86542db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐3】在四棱锥
中,底面
为平行四边形,
,
,O为
中点,
平面
,
,M为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/103bc195-75b9-4c03-9860-6c906f91c589.png?resizew=178)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求二面角
的正切值.
![](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/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24dcd50b9f6dba73b160297efd9574c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/103bc195-75b9-4c03-9860-6c906f91c589.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698335f4880c7a298f4898c83b6562bf.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,正三棱柱
的体积为
,
,P是面
内不同于顶点的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/44609e78-eb70-47f4-9a15-78aef8d58d74.png?resizew=149)
(1)求证:
;
(2)经过BC且与AP垂直的平面交AP于点E,当三棱锥E-ABC的体积最大时,求二面角
平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dbe55407b556be48d67cde5c5dc94f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/44609e78-eb70-47f4-9a15-78aef8d58d74.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbad7ad1465d1c4c177e3321e6ed12a.png)
(2)经过BC且与AP垂直的平面交AP于点E,当三棱锥E-ABC的体积最大时,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c6e71996c49b1345cf74afd8610959.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥S一ABCD中,底面ABCD是边长为2的正方形,平面SCD⊥平面ABCD,SD=SC=
.
![](https://img.xkw.com/dksih/QBM/2021/4/2/2691248154705920/2808801495449600/STEM/34620e7f-341a-4da7-a54f-ccfb9f8f7a3a.png?resizew=288)
(1)证明:BC⊥SD;
(2)求二面角A-SC-D的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
![](https://img.xkw.com/dksih/QBM/2021/4/2/2691248154705920/2808801495449600/STEM/34620e7f-341a-4da7-a54f-ccfb9f8f7a3a.png?resizew=288)
(1)证明:BC⊥SD;
(2)求二面角A-SC-D的大小.
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