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時鐘
Author:
戴宇宏
GeoGebra
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球体的体积推导
四邉形 (四年級) 教師版
兩位數加法
GeoGebra笔记功能体验课件
球体的体积推导（优化版）
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waaachen
垂足三角形
轨迹2016.4.16
分數1
Equal Angles, Equal Arcs and Equal Chords
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Equilateral Triangles
Natural Numbers
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