Odpowiedź:
b i d
Szczegółowe wyjaśnienie:
[tex] \frac{1}{6} = \frac{2}{12} \\ \frac{1}{4} = \frac{3}{12} \\ \frac{3}{12} - \frac{2}{12} = \frac{1}{12} [/tex]
[tex] \frac{3}{12} + \frac{2}{12} = \frac{5}{12} \\ \frac{12}{12} - \frac{5}{12} = \frac{7}{12} [/tex]
