在棱长为a的正方体ABCD-A1B1C1D1中,E是棱DD1的中点:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/5b0ea4fa-8ace-472f-9cd2-f18c245e0e0a.png?resizew=158)
(1)求点D到平面A1BE的距离;
(2)在棱
上是否存在一点F,使得B1F∥平面A1BE,若存在,指明点F的位置;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/5b0ea4fa-8ace-472f-9cd2-f18c245e0e0a.png?resizew=158)
(1)求点D到平面A1BE的距离;
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
更新时间:2019-06-14 20:11:56
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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,高为1的等腰梯形
中,
,
,现将
沿
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,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/09ea8336-3ad7-4d4c-9779-545aba5be820.png?resizew=396)
(1)当点
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(2)在
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(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fcce61c3d158b5331d6de10db3fb55d.png)
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解答题-问答题
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适中
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解题方法
【推荐2】如图,在四棱锥
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,
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(1)证明:平面
平面PBC;
(2)是否存在一点E,使得
平面BDE?若存在,请说明点E的位置,并证明你的结论;若不存在,请说明理由;
(3)若三棱锥
的体积是
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(3)若三棱锥
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【推荐1】正四棱台
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(1)求异面直线
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解答题-问答题
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适中
(0.65)
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