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許瑞霖
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GeoGebra
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兩組對邊相等的四邊形
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
三位數除以一位數（一）
画直线等分三角形的面积
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math test
滾動圓周來發現圓周長
國旗製作
Properties of a Parallelogram
圖形周界_F
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Unit Circle
Curve Sketching
Cosine
Linear Programming or Linear Optimization
Vectors 3D (Three-Dimensional)