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用数轴解释加法法则
Author:
丁玲
GeoGebra
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錐體建築師
三位數除以一位數（二）
四邊形的特性
異分母分數減法
【案例】圆柱体内放置一个大球六个小球
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proof AAS
練習 - 反射對稱
How to reconstruct a quadrilateral farm to a triangular one with the same area?
方塊圖(平均)
四年級除法
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Cone
General Quadrilateral
Fractal Geometry
Scalene Triangles
Pyramid