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Geometric Meaning of Derivatives
Author:
赵清河
GeoGebra
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兩位數除以一位數（一）
四邉形 (四年級) 教師版
三位數除以一位數（二）
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
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橢圓的定義畫圖
对数的运算性质
畢氏定理 (勾股定理) <Pythagorean theorem>
等分旋轉
極線對偶定理 / polar duality theorem 的複本
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Congruence
Area
Vectors
Polynomial Functions
Translation