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Author:
俞光隆
GeoGebra
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算柱 (兩位數)
拼砌四邊形
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
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方根化簡
高二上線性規劃_10
數值滑桿
複合不平等
動態幾何錯覺
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Integral Calculus
Linear Programming or Linear Optimization
Orthocenter
Rhombus
Trapezoid