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I love you
Author:
李春培
I love you
GeoGebra
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兩位數除以一位數（一）
拼砌四邊形
異分母分數減法
錐體建築師
画直线等分三角形的面积
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测试网页
軌跡一︰移動點與一固定點保持固定距離(圓)
三角形四心
Copy of 固定面積的圖形的周界變化
比一比看谁大
Discover Topics
Plane Figures or Shapes
Area
Prism
Equations
Linear Functions