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勾股定理证明
Author:
万超杰
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
拼砌四邊形
球體建築師
異分母分數減法
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阿基米德(3,6,6)
旋轉動畫
全等三角形
Difference of Two Cubes
正立方體的截面
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Subtraction
Prism
Geometric Distribution
Symmetry
Natural Numbers