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项剑文
GeoGebra
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四邉形 (四年級) 教師版
判斷球體
拼砌四邊形
球體建築師
算柱 (兩位數)
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三角
數線(小數的認識)
利用對摺找內心
指數1209
周长相等，正方形，长方形和正三角形，圆面积大小比较
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Frequency Distribution
Triangles
Trigonometry
Trapezoid
Quadratic Functions