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ptcc trigo level 2
Author:
Cheung Wing Chuen
GeoGebra
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異分母分數減法
画直线等分三角形的面积
球体的体积推导
三位數除以一位數（一）
【案例】2013年安徽高考15题
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三角形的邊長關係
三次函數02
堆朵3邊形(試算表版)
圓周 (圖形C) 的複本
开关灯
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Solids or 3D Shapes
Rhombus
Probability
Interest Calculation
Congruence