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根據百分率找數量（一）:例1的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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讀磅
比較五件物件的重量
直線的斜率
圓的切線方程
折扣
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waaachen
生日悖論
test
向量和的試題１
伊斯蘭窗花
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Probability
Equilateral Triangles
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Differential Equation
Complex Numbers