如图,在四棱锥
中,
底面
,
,
,
,
,点
为棱
的中点.
;
(2)若
为棱
上一点,满足
,求平面
与平面
所成角的余弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba814113887c21637c1954f244812f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437bc0b5b7815c77b4956f194fc6ef52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
更新时间:2023-11-15 10:21:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱柱ABCD-A1B1C1D1中,四边形ABCD是一个边长为2的菱形,∠DAB=60°.侧棱DD1⊥平面ABCD,DD1=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/0140fe9b-9dc5-4130-af20-85d6a838fbea.png?resizew=127)
(1)求二面角B-D1C-D的平面角的余弦值;
(2)设E是D1B的中点,在线段D1C上是否存在一点P,使得AE∥平面PDB?若存在,请求出
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/0140fe9b-9dc5-4130-af20-85d6a838fbea.png?resizew=127)
(1)求二面角B-D1C-D的平面角的余弦值;
(2)设E是D1B的中点,在线段D1C上是否存在一点P,使得AE∥平面PDB?若存在,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c72cd74713d764fb5e8baf69de7b78.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在四棱锥
中,
底面
,
,
//
,点
为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/01d725b2-6ded-4fac-9376-e1a756180ba1.png?resizew=172)
(1)求证:
平面
;
(2)求平面
与平面
的夹角;
(3)在线段
上是否存在点
,使得
平面
?若存在,求出
的值;若不存在,请说明理由.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/01d725b2-6ded-4fac-9376-e1a756180ba1.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d53cf3ab15beaf9960569932ad0812.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在长方体
中,
,
,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/2020/3/16/2421030274334720/2422238264344576/STEM/49013d22932c4d3c8bf1bc78f3e44382.png?resizew=126)
(1)求直线
与平面
所成角的正弦值;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50943279ee6f0299b3725eecd77bafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f61bef8cea2d737bce9eb07ca6c2d8f.png)
![](https://img.xkw.com/dksih/QBM/2020/3/16/2421030274334720/2422238264344576/STEM/49013d22932c4d3c8bf1bc78f3e44382.png?resizew=126)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74f12fea4418ec2ca3d1cc774c17747.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
中,
,
是直角三角形,
,
,点
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/cde1be72-c486-42eb-b790-5c9fdae810c6.jpg?resizew=157)
(1)求证:
;
(2)求直线
与平面
所成角的大小;
(3)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88380b0c9c24b8181111e505473c103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5021b04c31532a99b2ee0816a9f2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bab906d4fc26acb1a7f681a3bb2981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5b88ec996d2d117987e7303cefe4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcbceec52ae9468f15bc6846ad8c78b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/cde1be72-c486-42eb-b790-5c9fdae810c6.jpg?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7459863f058993e17b7dcf902053eccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f33997d5b4a0d9a3feafc1a075bc56.png)
您最近一年使用:0次