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2.并集
Author:
杜耀宗
2.并集
GeoGebra
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GeoGebra笔记功能体验课件
画直线等分三角形的面积
三位數除以一位數（二）
找出對稱軸
兩組對邊相等的四邊形
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proof24 羅文頡
【練習】資料整理與統計圖表─統計量值
環環相扣
硬幣繞多邊形面積分解圖
重心
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Translation
Curve Sketching
Integral Calculus
Geometric Transformations
Ellipse