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天干與地支
Author:
李春培
GeoGebra
New Resources
拼砌四邊形
畫出對稱圖形
判斷球體
錐體建築師
球体的体积推导（优化版）
Discover Resources
tan(α) tan(β) = ?
等腰直角三角形
齒輪作圖
ghseh 二次函數動畫上下平移
椭圆的定义
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Translation
Subtraction
Set Theory
Fractions
Scatter Plot