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Author:
Chan Yip-Cheung
GeoGebra
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拼砌四邊形
兩位數除以一位數（一）
球体的体积推导（优化版）
異分母分數減法
兩組對邊相等和有直角的四邊形
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內心
緯度、日照、影長
Angle Sum of Triangle
根據百分率找數量（二）: 例2的副本
初中动点问题的制作方法-单位向量法
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Inequalities
Rhombus
Square
Area
Median Line