如图所示,直三棱柱ABCA1B1C1的底面ABC为等腰直角三角形,∠ACB=90°,C点到AB1的距离为CE,D为AB的中点.求证:
![](https://img.xkw.com/dksih/QBM/2022/2/4/2909035110793216/2956053965520896/STEM/f032e47dfc734dbab2b5db795cfac41b.png?resizew=91)
(1)CD⊥AA1;
(2)AB1⊥平面CED.
![](https://img.xkw.com/dksih/QBM/2022/2/4/2909035110793216/2956053965520896/STEM/f032e47dfc734dbab2b5db795cfac41b.png?resizew=91)
(1)CD⊥AA1;
(2)AB1⊥平面CED.
2022高一·全国·专题练习 查看更多[2]
(已下线)8.6.2 第1课时 直线与平面垂直的判定(课时作业)-2021-2022学年高一数学同步精品课件+课时作业(人教A版2019必修第二册)(已下线)13.2.3直线与平面位置关系(2)线面垂直的判定与性质(备作业)-【上好课】2021-2022学年高一数学同步备课系列(苏教版2019必修第二册)
更新时间:2022-04-11 20:50:05
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解答题-问答题
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解题方法
【推荐1】如图,四边形
是一个半圆柱的轴截面,E,F分别是弧
,
上的一点,
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的中点,且
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(1)试确定点G的位置,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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(1)试确定点G的位置,使
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(2)求三棱锥
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【推荐2】如图,在四棱锥
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【推荐3】如图,点P是正方形ABCD外一点,PA⊥平面ABCD,PA=AB=2,且E,F分别是AB,PC的中点.
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【推荐1】如图,在三棱锥
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解答题-证明题
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【推荐2】如图所示的多面体
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名校
【推荐3】如图1,在矩形
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