Number Line tool 數線工具

Auteur:現代中學數學 Modern Secondary Mathematics

Onderwerp:Optelling, Getallen, Aftrekking

Demonstrate the addition and subtraction of directed numbers by using a number line. (Bilingual version. Supports both English and Chinese.) 利用數線展示有向數的加減。 (雙語版，支援中文和英文)

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