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侯杰材
GeoGebra
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sanjiaohanshu
三位數除以一位數（一）
異分母分數減法
球體建築師
小数 的副本
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翰林B4習p85_10
百分位分數
Simultaneous Equations (Linear and quadratic)
中國火柴遊戲二
C60足球模型（多边形）
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Fractions
Orthocenter
Quadratic Equations
Tree Diagrams
Cone