Răspuns:
[tex] \frac{5}{10} - \frac{3}{8} - \frac{2}{12} + \frac{7}{18} = \frac{1}{2} - \frac{3}{8} - \frac{1}{6} + \frac{7}{18} = \frac{36 - 27 - 12 + 28}{72} = \frac{25}{72} [/tex]
