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the definition of ellipse
Author:
丁明智
GeoGebra
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判斷球體
四邊形的特性
畫出對稱圖形
兩位數除以一位數（一）
異分母分數減法
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正方體及正四面體的對稱性質
蝴蝶線ggb
TRY_4.11.2016
長方形面積法 _單項式乘法
翰林數學_2下_CH3-1_多邊形的內角和
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Fractions
Angles
Straight Lines
Geometric Mean
Median Line