在三棱锥
中,
平面
,
,
,三棱锥
外接球的表面积为
,则二面角
正切值的最小值为________ .
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22-23高一下·山西·期末 查看更多[7]
山西省三重教育2022-2023学年高一下学期期末数学试题山西省太原市2022-2023学年高一下学期期末数学试题江西省清江中学2022-2023学年高一下学期6月期末数学试题(已下线)第10章 空间直线与平面(压轴题专练)-2023-2024学年高二数学单元速记·巧练(沪教版2020必修第三册)(已下线)第二章 立体几何中的计算 专题一 空间角 微点7 二面角大小的计算(二)【培优版】(已下线)高一下学期期末复习填空题压轴题二十三大题型专练(2)-举一反三系列(人教A版2019必修第二册)(已下线)第13章 立体几何初步 单元综合检测(重难点)-《重难点题型·高分突破》(苏教版2019必修第二册)
更新时间:2023-07-03 14:16:30
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【推荐1】棱长为12的正四面体ABCD与正三棱锥E—BCD的底面重合,若由它们构成的多面体ABCDE的顶点均在一球的球面上,则正三棱锥E—BCD的体积为_______ ,该正三棱锥内切球的半径为_______ .
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【推荐2】已知直角梯形
,沿
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【推荐1】在直三棱柱
中,
.有下列条件:
①
;
②
;
③
.
其中能成为
的充要条件的是__________ .(填上序号)
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①
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②
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③
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其中能成为
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【推荐2】在正方体
中(如图),已知点
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上运动,则下列四个命题:
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的体积不变;
②直线
与平面
所成的角的大小不变;
③二面角
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④
是平面
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其中真命题的编号是__________ .(写出所有真命题的编号)
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①三棱锥
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②直线
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③二面角
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④
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【推荐3】如图,点
在以
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点与
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外一点,且
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