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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
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【案例】2013年安徽高考15题
兩位數加法
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
三位數除以一位數（二）
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three
認識圓
Angle Sum of Triangle
Light reflected in ellipse
cow function
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Pyramid
Means
Cube
Linear Functions
Sine