如图所示,在四棱锥
中,
平面
,
平面
,
,
,又
,
,
为
中点.
平面
;
(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/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76d296e1cf0e421b3969c70064f6fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb64061e933aea7669294640c331bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1925035dc7e4d98cd72f96fbb60ec2d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
更新时间:2022-08-30 10:16:34
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在直四棱柱
中,
是棱
的中点,
. 请用向量法解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/72616247-edb6-4303-b5b1-0190545fc46c.png?resizew=161)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/886d2e7a039a3a3ffeb4026bbac96c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20bde01f83d1d521b4ccdb67c64356c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d9d62804daa6e74daaf8373d3f2e76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/72616247-edb6-4303-b5b1-0190545fc46c.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb6ea3b0d5150fd2ae8165514a33ff9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/882f8981-a3b4-461b-aabd-767ca33bd321.png?resizew=135)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值;
(3)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099edd3520292558184521a9af4e9064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d261edf9b4cfa7232e2bc184db1995.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/882f8981-a3b4-461b-aabd-767ca33bd321.png?resizew=135)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993830e5de2bbf858071d375bbf186f8.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,直三棱柱
中,
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955750150627328/2958710143041536/STEM/7c4e036662f64bd480d5d0051a384e2e.png?resizew=280)
(1)求证
平面
;
(2)求二面角
的大小的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31fc9e9075a05be23c9a7b4ccbdd020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550bdcd1e7f40a0ae1f6bd6ce3c845e1.png)
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955750150627328/2958710143041536/STEM/7c4e036662f64bd480d5d0051a384e2e.png?resizew=280)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d560542b646924eaf577480ac73281b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a232e224922bf635c56075a9283bdd.png)
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解答题-证明题
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适中
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【推荐2】如图,
为圆锥的顶点,
为圆锥底面的圆心,
为底面直径,四边形
是梯形,且
,
为底面圆周上一点,点
在
上.
,求证:
平面
;
(2)当
时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0be7e939e29ebb96a8622252b6ab21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f06f58813c2c9bd42bfc931d41e4f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703cb07903360e69f10ca3e5ef8e24a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963f0cda34e54f15725cee9448a4537e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e076c4c39e0591ed69ff780fb5a1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176b7beb3ee58b075801d6d7f6af1a4f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4dbea6a5faecdd8f6c06cf9fd43a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6a0cee8226e82cc57916e10d533369.png)
您最近一年使用:0次