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未命名
Author:
Eden
GeoGebra
New Resources
找出對稱軸
画直线等分三角形的面积
兩組對邊相等的四邊形
三位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
task 7
illusion 鏡射
孟氏定理 (Menelaus' theorem)
sweet sugar
纏繞畫2
Discover Topics
Root
Arithmetic Mean
Intersection
General Quadrilateral
Calculus