„Margföldun“: Munur á milli breytinga

<math>\frac{7}{3} \cdot \frac{9}{14} = \frac{1}{3} \cdot \frac{9}{2} = \frac{1}{1} \cdot \frac{3}{2} = \frac{1 \cdot 3}{1 \cdot 2} = \frac{3}{2} \!</math>

 

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