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Addition of 2 Directed Numbers
Author:
Chan Man Fai
Addition of 2 directed numbers
GeoGebra
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三位數除以一位數（二）
球體建築師
【案例】2013年安徽高考15题
柱體建築師
判斷球體
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Is this a prism 2
Animation of Refraction
gjc090c21內切圓的圓心
Copy of 分數與小數
（三）观察物体
Discover Topics
Quadratic Equations
Parallelogram
Unit Circle
Arithmetic Mean
Expected Value