Răspuns:
[tex] - 5 \frac{5}{11} \times 2 \frac{1}{5} = \frac{ - 5 \times 11 + 5}{11} \times \frac{2 \times 5 + 1}{5} \\ = \frac{ - 55 + 5}{11} \times \frac{10 + 1}{5} = \frac{ - 50}{11} \times \frac{11}{5} = \frac{ - 10}{1} \times 1 = - 10[/tex]
[tex] - 4 \frac{1}{8} \div 2 \frac{7}{16} = \frac{ - 4 \times 8 + 1}{8} \div \frac{2 \times 16 + 7}{16} = \\ = \frac{ - 32 + 1}{8} \div \frac{32 + 7}{16} = \\ = \frac{ - 31}{8} \div \frac{39}{16} = \frac{ - 31}{8} \times \frac{16}{39} = \frac{ - 31}{1} \times \frac{2}{39} = \frac{ - 62}{39} [/tex]
