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task1
Author:
chong yin tung
GeoGebra
New Resources
画直线等分三角形的面积
柱體建築師
找出對稱軸
兩位數加法
三位數除以一位數（二）
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立體幾何
Easter egg
讚2
滑桿動畫(起始檔案)
均值不等式的一种几何证明.许兴华数学
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Variance
Circle
Triangles
Quadrilaterals
Unit Circle