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  1. 1
    Skim penolakan nombor bulat murid darjah dua dan tiga /
    由 Sutriyono
    出版 1998
    主題: “...Addition Study and teaching (Elementary)...”
    Thesis 圖書
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  2. 2
    Teaching addition and subtraction to educationally sub-normal children /
    由 Ee, Jessie Leong Choo
    出版 1991
    主題: “...Addition Study and teaching (Elementary) Singapore....”
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