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保持比例

Author:hjyanghj

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四邊形的特性
兩組對邊相等的四邊形
畫出對稱圖形
兩位數除以一位數（二）
画直线等分三角形的面积

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Basketball
兩橢圓交集
三角形內部一點問題
Angles formed by parallel lines and transversal
勾股定理的毕氏证明

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Rectangle
Arithmetic Mean
Trigonometric Functions
Frequency Distribution
Vectors 3D (Three-Dimensional)

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