如图,四棱锥
中,
,
,
,
,
,
,点
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/aa0e0a19-b1a9-418c-9d83-0086f40f2ab3.png?resizew=222)
(1)求证:
;
(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/a98c8e36238ad90378e724466fcb6023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da4b84ed9d3ae849cf9b30d60df4cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9413e2ccbf2cef86516dfa61fd8b6219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f54161deed9fb6fa94318cd5a2efd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/aa0e0a19-b1a9-418c-9d83-0086f40f2ab3.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
更新时间:2018-03-09 20:48:14
|
相似题推荐
【推荐1】如图,在三棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/4b60b7d1-3b35-4889-a760-f32c70c43e9f.png?resizew=238)
(1)证明:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd31113c6f65e8b5ce30935f50df64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29e8a1eefb6776168969a1155c9e9c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/4b60b7d1-3b35-4889-a760-f32c70c43e9f.png?resizew=238)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
为正方形,
底面
,
,E为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/5d2bcfa6-4b1e-4ef0-b0eb-abd020ebfc70.png?resizew=176)
(1)证明:点F在线段
上移动时,
为直角三角形;
(2)若F为线段
的中点,求二面角
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/5d2bcfa6-4b1e-4ef0-b0eb-abd020ebfc70.png?resizew=176)
(1)证明:点F在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
(2)若F为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432b602bbaf82a4a40091ecfc8a8ffb0.png)
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【推荐3】如图所示,四棱锥
中,平面
平面
,四边形
为等腰梯形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454a37144b72f7ff9bb3f3fc8c54003e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
(2)求平面
与平面
所成的锐二面角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb771c545f6aac1c339796efdcadfd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454a37144b72f7ff9bb3f3fc8c54003e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐1】如图①,是由矩形
,
和
组成的一个平面图形,其中
,
,将其沿
折起使得
重合,连接
如图②.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8442f118-fd70-4ab4-9377-212ae5a5bf0c.png?resizew=347)
(1)证明:平面
平面
;
(2)若
为线段
中点,求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f0ab7952483e00b97cb9d8d8e8edcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7269e2c199802cbddb99a6070d39d2fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4840aae24af2fb3f47eb96c99fbc8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f45c6b93a871dc4dd5e66a9bfdecd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2085b833fb31b7e38cb16f1fce3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8442f118-fd70-4ab4-9377-212ae5a5bf0c.png?resizew=347)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7fb4bb4caccf79639a126064771da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2194add18a7df1a23cf1554dc2da1b40.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
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【推荐2】如图,在正方体
中.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/7bd4bac7-7210-4abe-b3b5-1424541362cc.png?resizew=180)
(1)证明:
平面
;
(2)求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/7bd4bac7-7210-4abe-b3b5-1424541362cc.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86eec8526479272d15bb3b171a46de0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
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【推荐1】设点E,F分别是棱长为2的正方体
的棱AB,
的中点.如图,以C为坐标原点,射线CD、CB、
分别是x轴、y轴、z轴的正半轴,建立空间直角坐标系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e4a91457-9baa-4940-b031-4f9aebe93018.png?resizew=341)
(1)求向量
与
的数量积;
(2)若点M,N分别是线段
与线段
上的点,问是否存在直线MN,
平面ABCD?若存在,求点M,N的坐标;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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e4a91457-9baa-4940-b031-4f9aebe93018.png?resizew=341)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee34937cd70ceaf35b2b633748c1e6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8b311e39d919a75a4a1c93aafda4e0.png)
(2)若点M,N分别是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456175ea34492f0bc025aaab668fa659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
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