已知Rt△ABC如图(1),∠C=90°,D.E分别是AC,AB的中点,将△ADE沿DE折起到PDE位置(即A点到P点位置)如图(2)使∠PDC=60°.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378400813678592/2379288476909568/STEM/42fb6ffb-506e-4978-907d-adcbf4cef906.png?resizew=496)
(1)求证:BC⊥PC;
(2)若BC=2CD=4,求点D到平面PBE的距离.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378400813678592/2379288476909568/STEM/42fb6ffb-506e-4978-907d-adcbf4cef906.png?resizew=496)
(1)求证:BC⊥PC;
(2)若BC=2CD=4,求点D到平面PBE的距离.
19-20高三·四川广元·阶段练习 查看更多[5]
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更新时间:2020-01-17 23:37:42
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【推荐1】如图,三棱锥P−ABC中,底面ABC是正三角形,
底面ABC,
平面PBC,垂足为G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/0d5e2164-b406-4417-81bd-41deb38605d7.png?resizew=170)
(1)G是否可能是
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(2)若G恰是
的重心,且
的边长为2,求点C到平面ABG的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071159cac13097ea0928285bc1be66d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/0d5e2164-b406-4417-81bd-41deb38605d7.png?resizew=170)
(1)G是否可能是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
(2)若G恰是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在如图所示的四棱锥
中,四边形
为菱形,且
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,M为
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/1d1ffd18-5ac5-4edc-8c15-eb593cfc5cdd.png?resizew=183)
(1)求证:平面
平面
;
(2)求点M到平面
的距离.
![](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/d95ff21f23e9d99539ed8447a7534865.png)
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(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点M到平面
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【推荐1】如图所示,半圆柱的轴截面为平面
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是圆柱底面的直径,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07956720a50ff238c0766a5d58d00e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e346722774c2a1913719928e352d78ef.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
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【推荐2】在如图的多面体中,EF⊥平面AEB,AE⊥EB,AD∥EF,EF∥BC,BC=2AD=4,EF=3,AE=BE=2,G是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/902ee763-53d1-4ab1-815c-70036b18cd3a.png?resizew=198)
(Ⅰ)求证:AB∥平面DEG;
(Ⅱ)求证:BD⊥EG;
(Ⅲ)求多面体ADBEG的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/902ee763-53d1-4ab1-815c-70036b18cd3a.png?resizew=198)
(Ⅰ)求证:AB∥平面DEG;
(Ⅱ)求证:BD⊥EG;
(Ⅲ)求多面体ADBEG的体积.
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