89| 4
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[几何] 来自讨论组群:正方形在圆周上平移一周扫过的区域面积 |
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Author|
kuing
Posted at 2025-4-10 23:03:06
Comment为什么
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Author|
kuing
Posted at 2025-4-10 23:10:39
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手机版Mobile version|Leisure Math Forum
2025-4-20 22:16 GMT+8
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