如图所示,在正方体ABCD-A1B1C1D1中,点O是AC与BD的交点,点E是线段OD1上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/5427609a-2690-43af-b583-fcb1d9c4dfa7.png?resizew=157)
(1)若点E为OD1的中点,求直线OD1与平面CDE所成角的正弦值;
(2)是否存在点E,使得平面CDE⊥平面CD1O?若存在,请指出点E的位置,并加以证明;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/5427609a-2690-43af-b583-fcb1d9c4dfa7.png?resizew=157)
(1)若点E为OD1的中点,求直线OD1与平面CDE所成角的正弦值;
(2)是否存在点E,使得平面CDE⊥平面CD1O?若存在,请指出点E的位置,并加以证明;若不存在,请说明理由.
2019·陕西汉中·一模 查看更多[8]
【校级联考】陕西省汉中市重点中学2019届高三下学期3月联考数学(理)试题【省级联考】山西省2019届高三百日冲刺考试数学(理)试题【市级联考】河南省新乡市2019届高三3月份质量检测数学(理)试题(已下线)理科数学-6月大数据精选模拟卷01(新课标Ⅱ卷)(满分冲刺篇)(已下线)解密07 空间几何中的向量方法(讲义)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练吉林省长春市东北师范大学附属中学2022届高三理科数学综合训练(一)北京交通大学附属中学2022-2023学年高二上学期期中考试数学试题四川省盐亭中学2022-2023学年高二下学期第一学月教学质量监测理科数学试题
更新时间:2021-04-17 08:45:37
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【推荐1】《九章算术》中,将四个面都为直角三角形的四面体称为鳖臑.如图,已知PA⊥平面ABC,平面PAB⊥平面PBC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/38d44498-03e0-428d-b0b4-75a07f5649e9.png?resizew=144)
(1)判断四面体P-ABC是否为鳖臑,并给出证明;
(2)若二面角B-AP-C与二面角A-BC-P的大小都是
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/38d44498-03e0-428d-b0b4-75a07f5649e9.png?resizew=144)
(1)判断四面体P-ABC是否为鳖臑,并给出证明;
(2)若二面角B-AP-C与二面角A-BC-P的大小都是
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【推荐2】如图,
是平面
外一点,四边形
是矩形,
⊥平面
,
,
.
是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2888214388162560/2889403956928512/STEM/f17dd65622934acab7d1ea8059448ab6.png?resizew=194)
(1)求证:PB∥平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)求证:平面
⊥平面
;
(3)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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(1)求证:PB∥平面
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(2)求证:平面
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐1】如图,在直三棱柱
中,底面ABC为等腰直角三角形,
,AB=AC=2,
,M是侧棱
上一点,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/0cbe0d6c-f5c1-4eca-8af8-441b957286d3.png?resizew=134)
(1)若
,求证:
;
(2)若
,求直线
与平面ABM所成角的正弦值;
(3)若
,求点M到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa575d601b92968dfcff972dfa111e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88517eaaa7c6f423f565f938404105a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e753dc81ed21f878fff89e98cccf24a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7d857811cbd619f868d951aa7a0ab8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db8814b2124793c2bdf3ea701fb14ca.png)
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【推荐2】如图已知斜三棱柱
中,∠BCA=90°,AC=BC=2,A1在底面ABC上的射影恰为AC的中点D,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/79728e02-1f41-4bac-8efa-1155309abc5a.png?resizew=157)
(1)求证:A1B⊥AC1;
(2)求直线A1B与平面A1B1C1所成角的正弦值;
(3)在线段C1C上是否存在点M,使得二面角
的平面角为90°?若存在,确定点M的位置;若不存在,请说明理由.
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(1)求证:A1B⊥AC1;
(2)求直线A1B与平面A1B1C1所成角的正弦值;
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【推荐3】如图,四棱锥
中,
底面ABCD,
,
,
,
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,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/3f91bf59-b166-433d-9a5b-56fbd3b6d4a4.png?resizew=215)
(1)证明:
平面PAD;
(2)求直线DM与平面PBC所成角的正弦值;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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(1)证明:
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(2)求直线DM与平面PBC所成角的正弦值;
(3)求三棱锥
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【推荐1】如图,在四棱锥
中,底面ABCD是直角梯形,
,
,
底面ABCD,点E为棱PC的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/cb23c0cd-f646-4594-aad1-c1475d1b1869.png?resizew=215)
(1)证明:
平面PAD;
(2)在棱PC上是否存在点F,使得二面角
的余弦值为
,若存在,求出
的值,若不存在,请说明理由.
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
(2)在棱PC上是否存在点F,使得二面角
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243fcd0b5e7fc1a4d55e191f5fcbd332.png)
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【推荐2】在四棱锥
中,底面
为矩形,点
为
的中点,且
.
.
(2)若
,点
为棱
上一点,平面
与平面
所成锐二面角的余弦值为
,求
的值.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c807097a923a5a7c72c7e32b259654e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951b9f77413d5f062acb300b09de1f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9425630dcfe5a824c44904d4f71e13.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
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