直三棱柱
的底面
上,
,点
、
分别在棱
、
上,且
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/0518b9c4-d31b-4573-80ca-f59a7cc0292c.png?resizew=161)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8ebe2ebedb5d6e590edc88f860dcb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bc2e76089594e4697c4b9fd083f51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/0518b9c4-d31b-4573-80ca-f59a7cc0292c.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50eda31bbc3d40f0b305d4ac673fc21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f5b7343a7aeb266bddc8fe765f35dd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f73038249a611568193c0bcc286fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1956db288a5a3b8c97d2539e9e5e4f85.png)
更新时间:2020-02-09 17:59:42
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】已知:如图,
是平面
的一条斜线,
是
在
内的射影,直线
在平面
上.求证:
当且仅当
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d7df4b723be4b6685475a19c899a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0270feaf08534fe711c915f4bfc8900.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/06d4c562-972c-4244-bf2e-475265dd4d62.png?resizew=134)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,边长为
的正方形
和高为
的等腰梯形
所在的平面互相垂直,
,
,
与
交于点
,点
为线段
上任意一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/0b484e74-97bb-4a5e-ba47-bd6492bb85fe.png?resizew=245)
(Ⅰ)求证:
平面
;
(Ⅱ)求
与平面
所成角的正弦值;
(Ⅲ)是否存在点
使平面
与平面
垂直,若存在,求出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df8360eeccf5d70edea78918255f771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559b8e5f19e5d149eeb156b1cca5fd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/0b484e74-97bb-4a5e-ba47-bd6492bb85fe.png?resizew=245)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1401ef8cb041acd35eb1c082754d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(Ⅲ)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3188e6eefc428571585b8c85f0d7151f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196124b0265983c886a684ed7940df4d.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知正方体
和平面
,直线
平面
,直线
平面
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712383585484800/2722853185544192/STEM/d94438e6-8411-4f7b-a9b9-6adec629afa4.png?resizew=221)
(1)证明:平面
平面
;
(2)点
为线段
上的动点,求直线
与平面
所成角的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712383585484800/2722853185544192/STEM/d94438e6-8411-4f7b-a9b9-6adec629afa4.png?resizew=221)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0a582c36d62d83c16425b2f54b4354.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,四棱锥P-ABCD的底面是菱形,
底面ABCD,
,
,点E是CD的中点,异面直线PE与AC所成角的余弦值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/f760f9cf-8ff4-4259-98d5-0dfa589bce25.png?resizew=178)
(1)求PA;
(2)求PE与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/f760f9cf-8ff4-4259-98d5-0dfa589bce25.png?resizew=178)
(1)求PA;
(2)求PE与平面PBD所成角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,在三棱柱
中,侧面
,
均为菱形,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643940293083136/2644722895364096/STEM/f711e55577584832a2a5d4c10b83a976.png?resizew=340)
(Ⅰ)求证:
平面
;
(Ⅱ)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282979cbfefc40e0dba735f586972f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643940293083136/2644722895364096/STEM/f711e55577584832a2a5d4c10b83a976.png?resizew=340)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cb62f4c1e0e023619922eb8a509c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc7e774e4ae40c23bf4ceed179230ca.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
您最近一年使用:0次