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一道勾股定理题
Author:
于卫芳
GeoGebra
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四邊形的特性
第八周作业
三位數除以一位數（二）
兩組對邊相等的四邊形
找出對稱軸
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Is this a prism 8
Ellipse_Vertical
計算圖形周界（小六下）
探究平行四邊形面積
matrix of rotation transformation
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Geometric Mean
Continuity
Cylinder
Equations
Mathematics