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将三角形面积一分为二
Author:
谢鹏
GeoGebra
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找出對稱軸
兩位數除以一位數（一）
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
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t6 geobra
Quiz on Addition and Subtraction of Directed Numbers (2) 有向數加減測驗(2)
畢氏定理完成20170330
Example 2
Similar triangles reasons 2
Discover Topics
Coordinates
Distributions
Rectangle
Volume
Congruence