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Author:
Henry Hsieh
GeoGebra
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近似值：有效數字
畫出對稱圖形
異分母分數減法
找出對稱軸
三位數除以一位數（一）
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PMC 2014-15 Q1
Name the prism 3
三角形3,4,5
反射路徑(角落進洞)
Copy of 學生自行製作棒形圖
Discover Topics
Set Theory
Rotation
Trigonometry
Distributions
Angles