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$\frac{1}{b} \cdot a = \frac{a}{b}$

Om ett bråk med täljaren

1

multipliceras med ett tal kan man ersätta täljaren med talet. Detta beror på att man multiplicerar talet med

1

:

\frac{1}{3} \cdot 2 = \frac{1 \cdot 2}{3} = \frac{2}{3} .

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