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小一_比較20以內的數
Author:
lkkbmaths teachers
GeoGebra
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拼砌四邊形
判斷球體
畫出對稱圖形
Fibonacci Clock
近似值：有效數字
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橢圓軌跡 (2)
Angle in Alternate Segment 1
方圓面積
Copy of 固定周界的長方形的面積變化
底数，指数，幂的函数关系
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Equations
Natural Numbers
Integral Calculus
Triangles
Median Line