Răspuns:
[tex]a) \frac{4}{5} - \frac{1}{10} = \frac{7}{10} [/tex]
[tex]b) \frac{5}{9} + \frac{4}{3} = \frac{17}{9} [/tex]
[tex]c) \frac{11}{12} + \frac{5}{3} = \frac{31}{12} [/tex]
[tex]d) \frac{1}{3} + \frac{13}{18} = \frac{19}{18} [/tex]
