[tex] \frac{2}{5} - \frac{1}{2} + \frac{4}{3} - \frac{7}{6} = \\ \frac{12}{30} - \frac{15}{30} + \frac{40}{30} - \frac{35}{30} = \\ = \frac{2}{30} = \frac{1}{15} [/tex]
Răspuns: 1/15
