如图,直三棱柱ABC—A1B1C1中,∠BAC=90°,AB=BB1=1,直线B1C与平面ABC成30°角,求二面角B-B1C-A的正弦值.
![](https://img.xkw.com/dksih/QBM/2012/1/11/1570684584329216/1570684589850624/STEM/c908ec7b7c5e400388ceded38ce0b431.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2012/1/11/1570684584329216/1570684589850624/STEM/c908ec7b7c5e400388ceded38ce0b431.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
12-13高二上·内蒙古呼伦贝尔·期末 查看更多[1]
(已下线)2011-2012学年内蒙古呼伦贝尔市扎兰屯一中高二上学期第一次综合考试理科数学
更新时间:2016-12-01 13:08:53
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相似题推荐
解答题-证明题
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适中
(0.65)
【推荐1】如图,在四棱锥
中,
为正三角形,底面ABCD为直角梯形
.
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734571141545984/2734870896877568/STEM/50c53e28484748eb8d16aa216dc3b028.png?resizew=183)
(1)求证:
;
(2)若二面角
的余弦值为
,求直线PA与平面PBC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6613857cf0183dd9f1e482eed61e36.png)
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734571141545984/2734870896877568/STEM/50c53e28484748eb8d16aa216dc3b028.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c911b404bbb8f8d5f1470585fa31ad97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
是边长为2的正方形,
是正方形的中心,
底面
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570038967869440/1570038973251584/STEM/b294c0abd2de4b75b897084b897da607.png?resizew=189)
求证:(1)
平面
;
(2)直线
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544172831dc1f210f3d90857dec62fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570038967869440/1570038973251584/STEM/b294c0abd2de4b75b897084b897da607.png?resizew=189)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知四棱锥
的底面是边长为
的正方形,
分别是棱
的中点,
,直线
与平面
所成的角的正弦值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363478095405056/2364054503374848/STEM/494487bdbc2c4b05a13304823a6a5351.png?resizew=104)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19c51bdef879285c2e4795ad0f806c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef52de3f61baccaed80fdb4c2deeef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363478095405056/2364054503374848/STEM/494487bdbc2c4b05a13304823a6a5351.png?resizew=104)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d2c1b3fd7524383736c72f4c0f1f27.png)
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适中
(0.65)
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【推荐2】如图,在正方形ABCD中,点E是AB的中点,点F是BC的中点,将△AED,△DCF分别沿DE,DF折起,使A,C两点重合于P,连接EF,PB.
(1)求证:
;
(2)点M是PD上一点,若
平面EFM,则
为何值?并说明理由;
(3)若
,求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/e1d57202-84cc-4ab8-b4fd-54dbcf6ed984.png?resizew=333)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55bc62f8afd58b044a0c24bf361d0c5.png)
(2)点M是PD上一点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced22fbe85d4a749c7b0b6bbae3ea3e7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33458ba13d7c6278f6b9318e78ba917f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948382a4c75dbb1dec52b444335989f1.png)
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