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ABC 2
Author:
yatan1018
GeoGebra
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算柱 (兩位數)
錐體建築師
異分母分數減法
兩位數除以一位數（二）
兩位數除以一位數（一）
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凹面鏡成像
Helicoid
救生員區域
勝者即正義，可愛即正義~
冰淇淋
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Multiplication
Equilateral Triangles
Quadratic Functions
Secant Line or Secant
Symmetry