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waaachen
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陳兪宏
艾董幾何題
GeoGebra
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算柱 (兩位數)
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
GeoGebra笔记功能体验课件
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排列組合
line equation
圖形拼砌與分割
test22
正N边形点列
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Area
Similar Triangles
Parabola
Calculus
Triangles