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Author:
李春培
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
小数 的副本
找出對稱軸
四邉形 (四年級) 教師版
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自製工具：「星星」
Tracing the Cosine Graph
过圆上一点作切线，三步
投擲兩粒骰子的可能結果
扇形滚动(圆心角半径可变)
Discover Topics
Quadrilaterals
Statistical Characteristics
Sequences and Series
Symmetry
Circle