Răspuns:
[tex] (\frac{1}{2} - \frac{2}{3} + \frac{3}{4}) \div \frac{14}{12} = \\ nc = 12 \\ ( \frac{6 - 8 + 9}{12} ) \div \frac{14}{12} = \\ \frac{7}{12} \div \frac{14}{12} = \\ \frac{7}{12} \times \frac{12}{14} = \\ \frac{84}{168} = \frac{1}{2} [/tex]
