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Author:
凯子巨人
GeoGebra
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兩位數除以一位數（一）
兩位數加法
異分母分數減法
畫出對稱圖形
sanjiaohanshu
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車輪
amoeba
圓系
CIRCLE
橢圓1--同心圓法
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Polygons
Hyperbola
Arithmetic Mean
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