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Author:
Tsang Ka Chun
GeoGebra
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兩位數加法
漂亮的摇摆曲线
圓周公式的應用
球体的体积推导（优化版）
兩位數除以一位數（二）
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尺規作圖找有理數點(以3分之5為例)
平方根
p10-4
B3C2-2例7-1
圓錐曲線
Discover Topics
Angles
Exponential Functions
Arithmetic Mean
Distributions
Dilation