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angles sum of a triangle 1
Author:
LAM YU SANG
GeoGebra
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GeoGebra笔记功能体验课件
球體建築師
異分母分數減法
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
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七巧板
peacock2
Copy of 閱讀鐘面及數字鐘（時和分）
四年級除法
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Fractions
Sphere
Subtraction
Right Triangles
Equilateral Triangles