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包含除法（1 ÷分數）的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
Topic:
Fractions
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兩組對邊相等的四邊形
錐體建築師
畫出對稱圖形
球體建築師
第八周作业
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相似三角形
題二
立方體拆解第一次
拋物線上的弓形區域
平面截圆柱体
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Random Variables
Congruence
Histogram
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Differential Equation