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勾股定理
Author:
wangjiezailai
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等的四邊形
畫出對稱圖形
算柱 (兩位數)
錐體建築師
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cvcvxcvxcvxcv
減法
Conic section-ellipse&hyperbola
圓與切線
正方体与球面的相交曲面
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Tree Diagrams
Division
Expected Value
Polygons
Constructions