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光的折：從空氣到玻璃
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学用数学
GeoGebra
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双心四边形
平行線的判定
龙形曲线-分形龙
第八周作业3
斐波那契螺旋弧线（表格法）
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固定周界的長方形面積變化
Distributive Law of Multiplication 2 (乘法的分配率 2)
平行六面體
Ex.3
B3C2-2例7-1
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Translation
Function Graph
Conic Sections
Piecewise Functions
Trapezoid