悠闲数学娱乐论坛(第3版)»论坛 › 数学区 › 初等数学讨论 › 求证四面体四个顶点角正弦平方和小于自然对数e

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[几何] 求证四面体四个顶点角正弦平方和小于自然对数e

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lihpb Post time 2023-11-16 22:09 |Read mode

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