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賺賠：例1
Author:
GeoGebra Institute of Hong Kong
賺賠
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百分數的應用
部分佔全部的百分率: 例1
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賺賠：例2
賺賠：例3
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Geometry : Plane Figures (幾何：平面圖)
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媽媽禮物3
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y-型区域
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RRRRRRRRRRRRRRRRRRRRR
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