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弧度制的由来
Author:
肖建伟
GeoGebra
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球体的体积推导（优化版）
球体的体积推导
球體建築師
四邉形 (四年級) 教師版
找出對稱軸
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神之作
分數認識
三角形面積公式B2
圓例2
平行四邊形的高
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Symmetry
Distributions
Indefinite Integral
Congruence
Set Theory