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內公切線段長求法
Author:
謝易達
GeoGebra
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三位數除以一位數（一）
兩位數除以一位數（一）
兩組對邊相等的四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
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trapezium
正四角柱
ghseh 二次函數描點法頂點法-3
GeoGebra 检测教程
任意凸多边形的滚动
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Median Line
Polygons
Quadratic Equations
Arithmetic Operations
Integers