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元旦快乐（制作：孟宝兴）
Author:
孟宝兴
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
畫出對稱圖形
四邉形 (四年級) 教師版
画直线等分三角形的面积
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Ex5C#6
國旗
Activity 2
定积分的概念（移动端）的副本
玖数小学数学（思维拓展）
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Root
Statistical Characteristics
Division
Piecewise Functions
Geometric Mean