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Perigal's Dissection
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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算柱 (兩位數)
球体的体积推导（优化版）
三位數除以一位數（一）
兩位數加法
異分母分數減法
Discover Resources
藝術
滾動的圓
如何判斷曲線夠不夠圓
中垂線
讀磅
Discover Topics
Derivative
Logic
Similar Triangles
Solids or 3D Shapes
LCM and GCD