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聖路易拱門
Author:
李春培
聖路易拱門
GeoGebra
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兩位數除以一位數（一）
三位數除以一位數（一）
四邉形 (四年級) 教師版
異分母分數減法
【案例】2018年全国1卷理科12题
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this is math pic
不規則填色
glt-c02-10 六角柱旋轉
Properties of a Square
P6數學
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Numbers
Random Experiments
Hyperbola
Quadratic Equations
Vectors 3D (Three-Dimensional)