如图,四棱锥
中,底面
为直角梯形,
,
,
,
,在锐角三角形
中,
.
(1)点E满足
,试确定
的值,使得直线
平面
,并说明理由.
(2)当
的长为何值时,直线
与平面
所成的角的正弦值为
.
![](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/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27781f1fdbadedb2374c9ddc92caebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de142e3e9414a818ffca462de8f01028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/cedb38ba-3960-42ca-8079-86ba4eb83e81.png?resizew=126)
(1)点E满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83595d3c0c90031daf4b6acdd7030a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
更新时间:2023-10-08 12:26:52
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,正方形
的边长为2,点
是边
的中点,将
沿
翻折得到
,且平面
平面
.
(1)求三棱锥
的体积;
(2)设线段
上一点
满足
,在
上是否存在点
使
平面
?若存在,求出
的长度;若不存在,说明理由.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6c7ab67df5c5920465af5ffe4a18cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0e7de42430ab7d6287de1c5f906a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca9d0361203c6b77d73d604f6c5e8b4.png)
(2)设线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea13ecd26e7289b715d59acd94c112c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b8c2721ada247b03f41f328539b301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea440fcc8f186f5de9105b18e152152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0f6e094d-9eec-4e2c-a0b5-262ca5840947.png?resizew=341)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图四棱锥
的底面是直角梯形,
,
,
平面
,点M是SA的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/140742d6-8644-4cb6-865f-6ea6abb580b5.png?resizew=168)
(1)求证:
平面
;
(2)求二面角
的大小;
(3)判断在线段SC上是否存在一点E,使得
平面
?若存在,确定E点的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696f6b2d30bf86cdb323a1da93ca6d23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/140742d6-8644-4cb6-865f-6ea6abb580b5.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0492b25f10ae45c39f8e9838519259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0455492c3db408f8d1d19c57d122a9ac.png)
(3)判断在线段SC上是否存在一点E,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e448430f520d89044cd537055125247b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
名校
【推荐1】如图,已知
是矩形,
,
分别为边
,
的中点,
与
交于点
,沿
将矩形
折起,设
,
,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/2017/4/19/1669136680771584/1669346708160512/STEM/ef466c6122f345e2934d7c8880067918.png?resizew=252)
(1)当
时,求
的值;
(2)点
时,点
是线段
上一点,直线
与平面
所成角为
.若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e453d251928fc8058ceeee602874702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f0b465713f1706416407ea1e1ea50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2017/4/19/1669136680771584/1669346708160512/STEM/ef466c6122f345e2934d7c8880067918.png?resizew=252)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b12fe9a4054ffbacca1b995751969a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316e85517919c422ecd81c95fb367d57.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72bf0fce80daad394f2a9d013829c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed01d1ff5a7f21a68fb3a1e5c7f393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745300c74839e4879622c410d183abee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在三棱锥A-BCD中,BC⊥CD,BC=CD,△ABD为边长是6的等边三角形,平面ABD⊥平面BCD.P为BC上靠近于B的三等分点,R为AD上一动点,S为CD上一动点.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848359063805952/2850594040840192/STEM/5617ca6ba0ef4c6395a8aa756159b816.png?resizew=172)
(1)若
,求证:AC⊥PS.
(2)若直线PR与平面ACD所成角的正弦值为
,求
的值.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848359063805952/2850594040840192/STEM/5617ca6ba0ef4c6395a8aa756159b816.png?resizew=172)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2025b17d886b57bcf8195670162b47.png)
(2)若直线PR与平面ACD所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafafedd146753463a09ba16275c8999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a2a6bd0598f2d2d5f41e001f947665.png)
您最近一年使用:0次