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同旁內角---水平平行綫
Author:
chanfushun
GeoGebra
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三位數除以一位數（一）
拼砌四邊形
GeoGebra笔记功能体验课件
判斷球體
球體建築師
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分數乘法與除法
外角定理直觀教材
表面積
橢圓3--平行四邊形法
平行四边形个数
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Planes
Differential Calculus
Cube
Rational Numbers