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Hovedindhold

Omskrivning af periodiske decimaltal til brøker (del 1 af 2)

Her vises hvordan et periodisk decimaltal omskrives til en brøk ved at bruge nogle få trin. Først sættes decimaltallet lig med en variabel. Dernæst ganges med 10 og det oprindelige decimaltal trækkes fra. Til sidst divideres på begge sider med 9 for at få en brøk. For eksempel 0,7777... omskrives til 7/9 og 1,222222 omskrives til 11/9.

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Lavet af Sal Khan.

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