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gjh-g05-00 平方差公式
Author:
均一
GeoGebra
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畫出對稱圖形
找出對稱軸
拼砌四邊形
錐體建築師
三位數除以一位數（一）
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拿破侖定理(內拿破侖)證明三
性質三十三_四邊形四邊外接指定條件的平行四邊形
Copy of Triangular Number
活动三：应用性质
画直线等分三角形的面积
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Equations
Unit Circle
Set Theory
Rotation
Square