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Author:
赵林
GeoGebra
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兩位數加法
漂亮的摇摆曲线
空间中两直线的位置关系
讀磅
三位數除以一位數（二）
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三角形三內角和
Primeter
圓上的角任務(三): 提示卡
Quiz on Signs of Coefficients of Quadratic Functions 二次函數係數的正負號：測驗
老師講解6
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Random Experiments
Hypothesis Testing
Intersection
Indefinite Integral
Addition