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Author:
Tsang Ka Chun
GeoGebra
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找出對稱軸
兩位數加法
兩位數除以一位數（二）
三位數除以一位數（二）
異分母分數減法
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旋轉體：Washer Method
Copy of Liu Hui's Method of Finding π
venn图
a sin(bx+c) + d 的圖形的副本
热带风暴storm
Discover Topics
Diagrams
Area
Real Numbers
Dilation
Orthocenter