Выполни сложение: -4/7 + (-2/7)

-a) $-\frac{4}{7} + (-\frac{2}{7}) = -\frac{4}{7} - \frac{2}{7} = -\frac{6}{7}$. -б) $-\frac{3}{7} + (-\frac{3}{4}) = -\frac{3}{7} - \frac{3}{4} = -\frac{12}{28} - \frac{21}{28} = -\frac{33}{28} = -1\frac{5}{28}$. -в) $-\frac{5}{9} + (-\frac{7}{8}) = -\frac{5}{9} - \frac{7}{8} = -\frac{40}{72} - \frac{63}{72} = -\frac{103}{72} = -1\frac{31}{72}$. -г) $-2\frac{2}{9} + (-5\frac{5}{18}) = -2\frac{4}{18} - 5\frac{5}{18} = -7\frac{9}{18} = -7\frac{1}{2} = -7,5$. -д) $-3\frac{3}{5} + (-5,9) = -3,6 - 5,9 = -9,5$. -e) $-2\frac{1}{6} + (-4,75) = -2\frac{1}{6} - 4\frac{3}{4} = -2\frac{2}{12} - 4\frac{9}{12} = -6\frac{11}{12}$. **Ответы:** -a) $-\frac{6}{7}$ -б) $-1\frac{5}{28}$ -в) $-1\frac{31}{72}$ -г) $-7,5$ -д) $-9,5$ -e) $-6\frac{11}{12}$