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weihaoxia
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weihaoxia
GeoGebra
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近似值：有效數字
算柱 (兩位數)
四邉形 (四年級) 教師版
找出對稱軸
兩組對邊相等和有直角的四邊形
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盒子的體積
一般變換
小阿樂
箭头平移动画
平行四邊形的面積的副本
Discover Topics
Tangent Function
Algebra
Parametric Curves
Constructions
Subtraction