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Author:
rogertsui
GeoGebra
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兩位數除以一位數（二）
兩位數除以一位數（一）
算柱 (兩位數)
異分母分數減法
兩組對邊相等的四邊形
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雜項
八個方向
同餘
函數平移
整数乘法演示
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Secant Line or Secant
Mathematics
Exponent
Rectangle
Geometric Mean