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Christmas Tree
Author:
陳隆期
GeoGebra
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四邊形的特性
異分母分數減法
兩位數加法
直角坐標平面上的旋轉變換
兩位數除以一位數（二）
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圓外切及內切
Compare areas by cutting shapes Q1
拋物線6--包絡線法
商高定理\水2的副本
兩位數除三位數(商=10)
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Root
Quadratic Equations
Means
Fractal Geometry
Scalene Triangles