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Author:
昌SIR
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GeoGebra
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四邊形的特性
兩組對邊相等和有直角的四邊形
兩位數加法
異分母分數減法
球體建築師
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BMIBMI
镂空菱形六十面体
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Discover Topics
Arithmetic Mean
LCM and GCD
Geometry
Intersection
Quadrilaterals