Răspuns:
[tex] \frac{2}{3} + \frac{1}{2} = \frac{7}{6} [/tex]
[tex] \frac{13}{2} - \frac{5}{6} = \frac{34}{6} = \frac{17}{3} [/tex]
[tex] \frac{2}{5} \times \frac{3}{4} = \frac{6}{20} = \frac{3}{10} [/tex]
[tex] \frac{1}{5} \div \frac{3}{7} = \frac{1}{5} \times \frac{7}{3} = \frac{7}{15} [/tex]
Mult succes..