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Author:
Chen, shih-hsiung
GeoGebra
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画直线等分三角形的面积
畫出對稱圖形
四邉形 (四年級) 教師版
第八周作业
兩位數加法
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正方形和長方形有甚麼特性？
过圆上一点作切线，三步
三角形
中垂線性質
圖二 的複本
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Median Line
Vectors 3D (Three-Dimensional)
Quadrilaterals
Indefinite Integral
Addition