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線性規劃
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+x sir
GeoGebra
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四邊形的特性
球体的体积推导（优化版）
拼砌四邊形
異分母分數減法
畫出對稱圖形
Discover Resources
ray tracing 2 lens
指數與對數的對稱性
翰林B4講p189_8
同心圓+等分割線
circle: line from centre
Discover Topics
General Quadrilateral
Pyramid
Interest Calculation
Arithmetic Mean
Intersection