Выполните вычисления с обыкновенными дробями: 1 - 7/12, 8 - 3/5, 13 3/5 - 6 и другие.

**Ответы:** 1) $1 - \frac{7}{12} = \frac{12}{12} - \frac{7}{12} = \mathbf{\frac{5}{12}}$ 2) $8 - \frac{3}{5} = 7\frac{5}{5} - \frac{3}{5} = \mathbf{7\frac{2}{5}}$ 3) $13\frac{3}{5} - 6 = \mathbf{7\frac{3}{5}}$ 4) $12 - 4\frac{3}{4} = 11\frac{4}{4} - 4\frac{3}{4} = \mathbf{7\frac{1}{4}}$ 5) $10\frac{1}{2} - 4\frac{5}{14} = 10\frac{7}{14} - 4\frac{5}{14} = 6\frac{2}{14} = \mathbf{6\frac{1}{7}}$ 6) $5\frac{3}{8} - 3\frac{5}{6} = 5\frac{9}{24} - 3\frac{20}{24} = 4\frac{33}{24} - 3\frac{20}{24} = \mathbf{1\frac{13}{24}}$ 7) $28\frac{5}{8} + 23\frac{3}{8} = 51\frac{8}{8} = \mathbf{52}$ 8) $2\frac{1}{7} + 3\frac{3}{8} = 2\frac{8}{56} + 3\frac{21}{56} = \mathbf{5\frac{29}{56}}$ 9) $2\frac{1}{7} + 3\frac{2}{3} + 4\frac{5}{21} = 2\frac{3}{21} + 3\frac{14}{21} + 4\frac{5}{21} = 9\frac{22}{21} = \mathbf{10\frac{1}{21}}$ 10) $12\frac{7}{12} + 3\frac{8}{9} - 4\frac{3}{4} = 12\frac{21}{36} + 3\frac{32}{36} - 4\frac{27}{36} = 15\frac{53}{36} - 4\frac{27}{36} = 11\frac{26}{36} = \mathbf{11\frac{13}{18}}$