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Author:
Alex Leong
GeoGebra
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兩組對邊相等和有直角的四邊形
柱體建築師
球體建築師
兩位數加法
三位數除以一位數（二）
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EnergyMath 2-3 複數乘法的幾何意義
trapezium
軌道
希羅公式
數學電腦繪圖&解題
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Constructions
Ratios
Translation
Quadratic Equations
Fractal Geometry