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三角函數的由來
Author:
陳政任
GeoGebra
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四邊形的特性
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（二）
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題八
相似多邊形-縮放的性質
Addition of 3 Directed Numbers
Copy of 蔡01
小遊戲
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Definite Integral
Pie Chart or Circle Chart
Reflection
Translation
Area