我国古代数学名著《九章算术》中记载的“刍䠢”指底面为矩形,顶部只有一条棱的五面体.如图,五面体
是一个“刍䠢”,四边形
为等腰梯形,
,
,
,则该“刍䠢”的体积为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
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更新时间:2023-02-17 23:01:32
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【推荐1】下图是一个几何体的三视图.若它的体积是3
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【推荐2】如图,某款酒杯的上半部分为圆锥,且该圆锥的底面直径和母线长均为6.若在该酒杯内放置一个圆柱形冰块,要求冰块高度不超过酒杯口高度,当放置的圆柱形冰块的体积最大时,其高度为______ .
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【推荐1】如图,正方体
的棱长为
,若空间中的动点
满足
,
,则下列命题正确的是______ .(请用正确命题的序号作答)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/5c1ac0f3-670e-45a9-abfb-88a06091f5ef.png?resizew=161)
①若
,则点
到平面
的距离为
;
②若
,则二面角
的平面角为
;
③若
,则三棱锥
的体积为
;
④若
,则点
的轨迹构成的平面图形的面积为
.
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①若
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②若
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③若
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④若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
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【推荐2】已知一圆锥的顶点和底面的圆周都在球
的球面上,则该圆锥与球
的体积比的最大值为________ .
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【推荐1】如果一条直线与一个平面垂直,那么称此直线与平面构成一个“正交线面对”.在正方体中,由两个顶点确定的直线与由顶点确定的平面构成的“正交线面对”的个数为______ .
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【推荐2】如图,在边长为2的正方体
中,点P是该正方体对角线
上的动点,给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712178353414144/2712219612504064/STEM/4ff8538e-478d-46d6-ba3b-e72ebf271793.png)
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c17c529214eb10f3b29856db1969b5.png)
②
面积的最大值是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
③
面积的最小值是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
④当
时,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a52848aff08399a36f217356007a4b.png)
其中所有正确结论的序号是___________ .
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②
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③
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其中所有正确结论的序号是
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【推荐1】三棱锥D-ABC中,△BCD是边长为2的正三角形,△BCD与△ABC所在平面互相垂直,且AC=1,
.则AD=___________ .
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【推荐2】已知四棱锥
的体积是
,底面
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平面
,则四棱锥
的外接球的体积为________ .
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【推荐3】在四棱锥
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平面
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与平面
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___________
(填“>”“<” “≥” “≤”).
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