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五角星
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GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數（一）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
四邊形的特性
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題九
正方體交角
y=a*sin(b*x)
固定周界長方形的面積變化（二）
基础知识
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Congruence
Addition
Plane Figures or Shapes
Intersection
Exponential Functions