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1989全国文18
Author:
常振虎
GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
柱體建築師
兩位數除以一位數（二）
畫出對稱圖形
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整數÷整數_工作紙（一）_題4
Quiz on Solving Right Triangles (Finding Angles) 解直角三角形：測驗2（求角度）
圖解畢氏定理
Origami-Trisect An Angle
Center_Circle_Solution
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Unit Circle
Mathematics
Hypothesis Testing
Symmetry
Median Line