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[几何] 正方体截面

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guanmo1 posted 2018-9-6 19:53 |Read mode

求证：正方体的五边形截面和六边形截面中，以正六边形截面面积最大。

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isee posted 2018-9-6 20:30

回复 1# guanmo1

是 2018年全国卷I理科第12题的发展？

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original poster guanmo1 posted 2018-9-6 22:00

自主招生模拟卷上的问题。

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original poster guanmo1 posted 2018-9-11 21:45

各路高手：求解答。

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hbghlyj posted 2023-4-18 09:05

同样的问题 forum.php?mod=viewthread&tid=10706

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