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翰林數學_2下_CH3-1_三角形的內角和
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翰林數學
GeoGebra
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四邉形 (四年級) 教師版
找出對稱軸
錐體建築師
拼砌四邊形
【案例】2018年全国1卷理科12题
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圓面積計算
扇形面積
向量的伸縮
circuit
魔术师的地毯
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Special Points
Multiplication
Complex Numbers
Congruence
Probability