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Author:
Big Lee
GeoGebra
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兩位數加法
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
四邊形的特性
【案例】圆柱体内放置一个大球六个小球
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waaachen
拋物線
旋轉對稱
沈暐珊 橢圓反射
属于与不属于
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Percentages
Natural Numbers
Functions
Numbers
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