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金印的展开图
Author:
赵林
金印的展开图
GeoGebra
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伊朗國旗 (Codex╱2026.10.07)
幾何作圖題：切三圓（題目）
世界平面地圖 (Codex╱2026.10.07)
算柱 (兩位數)
近似值：有效數字
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