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赵林
GeoGebra
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兩位數加法
錐體建築師
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
畫出對稱圖形
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aaa aaa aaa aaa
路徑二動畫
repetitive square
畢氏定理-面積切割法
同旁內角---水平平行綫
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Tangent Function
Differential Calculus
Translation
Scalene Triangles
Functions