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What's the Difference?

David Costa

出版	Xlibris Corporation, 2004-06
主題	Juvenile Nonfiction / Activity Books / GeneralJuvenile Nonfiction / Mathematics / GeneralJuvenile Nonfiction / Study Aids / General
ISBN	14134485509781413448559
URL	http://books.google.com.hk/books?id=vaVUPQAACAAJ&hl=&source=gbs_api

註釋

Simple text and photographs explain the difference between "take-away" subtraction and "difference" subtraction