如图,已知正方体
的棱长为1,点
是棱
上的动点,
是棱
上一点,
.
;
(2)若直线
平面
,试确定点
的位置,并证明你的结论;
(3)设点
在正方体的上底面
上运动,求总能使
与
垂直的点
所形成的轨迹的长度.(直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094e639c2b31dc54b1b3e6456e77843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb2846cfd42301993d804ef610cd88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993fb44a3f456e34faaf2659e48a97a6.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366c8c23a3462827d0249dae2ec943cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1807490f2fbbdcbd5dcd6d76d3a9cab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d4bbb7b124c93ba403177bb1b2c49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19628fe6b475b71525f0e72bc4dec9b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
17-18高一下·北京西城·期末 查看更多[6]
【全国市级联考】北京市西城区2017-2018学年高一下学期期末考试数学试题福建省莆田市第一中学2018-2019学年高一下学期期中数学试题北京市第八中学2020-2021学年高二下学期期末数学试题(已下线)微专题13 轻松搞定立体几何的轨迹问题(已下线)第三章 空间轨迹问题 专题三 立体几何轨迹长度问题 微点2 立体几何轨迹长度问题综合训练【培优版】北京市陈经纶中学2023-2024学年高一下学期期中练习数学试卷
更新时间:2018-07-12 21:35:20
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【推荐1】在四棱锥
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【推荐2】如图,四棱锥
中,
为等腰三角形,
,
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/a83f0846-4385-46e2-9b48-760cdd94cde7.png?resizew=186)
(1)证明:
;
(2)若
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在线段
上,
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与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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(1)证明:
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(2)若
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【推荐3】如图,在直三棱柱ABC-A1B1C1中,AC
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![](https://img.xkw.com/dksih/QBM/2021/4/6/2693778968322048/2696834730434560/STEM/ad0fbb55-6590-4b36-a6a4-16c47014259a.png?resizew=211)
(1)求证:
;
(2)在线段AC1上是否存在一点D,使得
与平面
所成的角为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2021/4/6/2693778968322048/2696834730434560/STEM/ad0fbb55-6590-4b36-a6a4-16c47014259a.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98faac7a82235d53bb4b6abe7ee54951.png)
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【推荐1】在三棱锥
中,
平面
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139603611648/2549843319603200/STEM/14e2f50640164f9c8315d2d5beaa789c.png?resizew=181)
(1)证明:
平面
;
(2)若
为
的中点,且
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
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![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139603611648/2549843319603200/STEM/14e2f50640164f9c8315d2d5beaa789c.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
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【推荐2】如图,E是以AB为直径的半圆O上异于A、B的点,矩形ABCD所在的平面垂直于半圆O所在的平面,且AB=2AD=2.
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(1)求证:
;
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