Răspuns:
[tex]c)8 \frac{4}{5} - 3 \frac{1}{5} = \\ = \frac{8 \times 5 + 4}{5} - \frac{3 \times5 + 1}{5} = \frac{40 + 4}{5} - \frac{15 + 1}{5} = \frac{44}{5} - \frac{16}{5} = \frac{28}{5} [/tex]
[tex]d)18 \frac{2}{11} - 7 \frac{5}{11} = \\ = \frac{18 \times 11 + 2}{11} - \frac{7 \times 11 + 5}{11} = \frac{198 + 2}{11} - \frac{77 + 5}{11} = \frac{200}{11} - \frac{82}{11} = \frac{118}{11} [/tex]