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根據百分率找數量（一）: 例4的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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拼砌四邊形
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
兩位數加法
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