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Author:
李政憲
GeoGebra
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拼砌四邊形
畫出對稱圖形
柱體建築師
異分母分數減法
三位數除以一位數（一）
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畫鐘面
分數與小數
三角形外心的角度關係
折三角形
P.5 面積問題04
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Ellipse
Tree Diagrams
Differential Equation
Inequalities
Random Experiments