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calculează:
[tex] \frac{5}{5} + \frac{9}{5} + \frac{4}{5} - \frac{10}{5} [/tex]
[tex] \frac{4}{3} - \frac{3}{3} + \frac{6}{3} [/tex]
[tex] \frac{15}{12} + \frac{18}{12} - \frac{11}{12} [/tex]