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折扣 例6的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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異分母分數減法
畫出對稱圖形
錐體建築師
直角坐標平面上的旋轉變換
兩位數除以一位數（一）
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aaaaaaaa
gjh-h01-01 畢氏數三角形
追击问题
湯圓rice ball
【折纸】A4纸折四面体
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Addition
Fractions
Calculus
Correlation
Arithmetic Mean