如图,在四棱锥P—ABCD中,PA⊥平面ABCD,四边形ABCD为正方形,PA=AB=4,
![](https://img.xkw.com/dksih/QBM/2012/8/10/1570964574920704/1570964580163584/STEM/72867e07bb1e488ab7434ead09e19ab4.png)
G为PD中点,E点在AB上,平面PEC⊥平面PDC.
(Ⅰ)求证:AG⊥平面PCD;
(Ⅱ)求证:AG∥平面PEC;
(Ⅲ)求点G到平面PEC的距离.
![](https://img.xkw.com/dksih/QBM/2012/8/10/1570964574920704/1570964580163584/STEM/72867e07bb1e488ab7434ead09e19ab4.png)
G为PD中点,E点在AB上,平面PEC⊥平面PDC.
(Ⅰ)求证:AG⊥平面PCD;
(Ⅱ)求证:AG∥平面PEC;
(Ⅲ)求点G到平面PEC的距离.
11-12高一下·江西赣州·阶段练习 查看更多[1]
(已下线)2011-2012学年江西省会昌中学高一下学期第二次月考数学试卷
更新时间:2016-12-01 22:38:31
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐1】如图所示,
平面
,四边形
为直角梯形,四边形ADFE为矩形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/0fc47c3a-bce9-4a1c-8c59-bcf89536a4a4.png?resizew=187)
(1)记平面
平面
,求证:
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;
(2)在线段
上是否存在
点,使得二面角
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.若存在,求出
长;若不存在,说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c23d9cb4911beb7d69965d69cf1485.png)
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(1)记平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d7263b36bc05d3ef2082e482c4c479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df5f4a4225ec86ff419be333c3161a8.png)
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(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图1,在平行四边形
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内的正投影点F在
上,H在
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(1)证明:H为
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(1)证明:H为
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(2)求B到平面
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解答题-证明题
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【推荐1】如图所示,在棱长为2的正方体
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、
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(1)求证:
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(1)求证:
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解答题-证明题
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适中
(0.64)
【推荐2】如图,在直三棱柱
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(1)求证:
平面
;
(2)试在棱
上找一点M,使得
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(1)求证:
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(2)试在棱
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解答题-证明题
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适中
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【推荐1】如图,四棱锥P-ABCD的底面为正方形,平面
平面ABCD,
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![](https://img.xkw.com/dksih/QBM/2020/10/15/2571751481794560/2573481519177728/STEM/37dcd70645524c6cb03551414d068bee.png?resizew=143)
(1)求证:
;
(2)若直线PA与BC所成角为
,求平面PAD与平面PBC所成锐二面角的余弦值.
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(2)若直线PA与BC所成角为
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解答题-作图题
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适中
(0.64)
【推荐2】如图所示,在四棱锥
中,
平面
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![](https://img.xkw.com/dksih/QBM/2016/5/20/1572643202678784/1572643208347648/STEM/f126915e67d24850b4717b1d83fc697d.png)
(1)在网格中画出四棱准
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平面
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(3)在棱
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平面
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(1)在网格中画出四棱准
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(2)求证:平面
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(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4a0d511365abd9df144a412ccd4615.png)
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