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Author:Anthony OR 柯志明, GeoGebra Institute of Hong Kong

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兩組對邊相等和有直角的四邊形
兩位數加法
【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
異分母分數減法

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proof AAS
Testing: addition
集合的运算
球表面积的一种特殊推导
分物活動 1

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Optimization Problems
Vectors 2D (Two-Dimensional)
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