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Author:
郭勇
GeoGebra
New Resources
兩位數加法
兩位數除以一位數（二）
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
Discover Resources
Circle on a Sphere
(正)長方體
圆的面积 - 排列组合法
會暫停的指針
congruent triangles_provided by Mr Yeung Kar Chun
Discover Topics
Continuity
Square
Cylinder
Derivative
Arithmetic Operations