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旋轉對稱 Rotational symmetry
Author:
TANG TSZ YUEN
Topic:
Symmetry
GeoGebra
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球体的体积推导（优化版）
異分母分數減法
判斷球體
三位數除以一位數（二）
四邉形 (四年級) 教師版
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圓&五邊形
題A至E
frog 4
扇形柱(調整底面圓的分割數，柱高)
Triangle
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Tree Diagrams
Multiplication
Constructions
Indefinite Integral
Congruence