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flag 北韓國旗 North Korea
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学用数学
GeoGebra
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找出對稱軸
画直线等分三角形的面积
算柱 (兩位數)
三位數除以一位數（二）
異分母分數減法
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色彩視覺藝術
test1
製作對稱圖形 LEVEL 2
untitled a01
雙曲線3-等軸法
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Tree Diagrams
Constructions
Trigonometric Functions
Surface
Mathematics