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Author:
W.L. Wong, Albert
GeoGebra
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兩位數加法
四邊形的特性
柱體建築師
球体的体积推导（优化版）
四邉形 (四年級) 教師版
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Surface area of sphere
concurrence of medians and bimedians of tetrahedron
拋物線教學_2016
小六容量與體積_裝箱問題
完全图及其变形
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Triangles
Mode
Root
Straight Lines
Addition