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六下：面的旋转
Author:
肖昆明
GeoGebra
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兩位數加法
畫出對稱圖形
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
GeoGebra笔记功能体验课件
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數位學習社103 12 15
Arbelos
reflectional symmetry_2
路旁的树
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Addition
Exponent
Congruence
Cube
Trigonometric Functions