Hvordan passer et decimal tal, når dets decimaler gentages, ind i et sæt af tal? Vi skal se om et sådant tal 3,4028 er et reelt tal, et rationalt tal eller begge dele. Vi skal bruge multiplikation, subtraktion og en smule algebra for at finde ud af, om tallet kan omskrives til en brøk. Lavet af Sal Khan og Montereys Institut for teknologi og undervisning.
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