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Flag 南韓 SouthKorea
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学用数学
GeoGebra
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双心四边形
斐波那契螺旋弧线（表格法）
撒针估算面积实验
异形操场
龙形曲线-分形龙2
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Simultaneous Linear Equations 聯立二元一次方程
整數÷整數_工作紙（一）_題5
立體圖形－截面
包絡橢圓
根據百分率找數量（一）:例1的副本
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Subtraction
Orthocenter
Special Points
Centroid or Barycenter
Cone