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perimeter
Author:
Yvonne Fung
,
GeoGebra Institute of Hong Kong
GeoGebra
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兩位數加法
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
三位數除以一位數（一）
畫出對稱圖形
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以反演看 n 次方根
conjugate
Copy of 閱讀鐘面及數字鐘（時和分）
扇形弧長公式1
∆ABD 面積 = ?
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Continuity
Equilateral Triangles
Terms
Circle
Square