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椭圆的定义

Author:guomenglin

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美國國旗 (Codex 版)
算柱 (兩位數)
畫出對稱圖形
Earth with coastline
世界平面地圖 (Codex╱2026.10.07)

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認識小數
證平行四邊形 (對邊相等)
周界
圓面積的應用
勾股定理证明2

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Quadratic Functions
Geometric Mean
Fractions
Cosine
Normal Distribution

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