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Author:
俞光隆
GeoGebra
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四邉形 (四年級) 教師版
算柱 (兩位數)
兩組對邊相等的四邊形
判斷球體
GeoGebra笔记功能体验课件
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refraction law
z=x^2-y^2
畢式定理 (13)
三角格紋
正六邊形串珠
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Parametric Curves
Translation
Congruence
Arithmetic Operations
Histogram