4.180 Выполните сложение: a) $$-1\frac{1}{2} + (-2\frac{1}{2})$$ b) $$-4\frac{9}{14} + (-1\frac{1}{7})$$ v) $$-5\frac{7}{12} + (-2\frac{3}{4})$$ г) $$-3\frac{4}{9} + (-8\frac{5}{6})$$ д) $$-5\frac{12}{17} + (-1\frac{15}{24})$$ e) $$- \frac{9}{28} + (-4\frac{9}{35})$$

a) $$-1\frac{1}{2} + (-2\frac{1}{2}) = -\frac{3}{2} - \frac{5}{2} = -\frac{8}{2} = -4$$ b) $$-4\frac{9}{14} + (-1\frac{1}{7}) = -\frac{65}{14} - \frac{8}{7} = -\frac{65}{14} - \frac{16}{14} = -\frac{81}{14} = -5\frac{11}{14}$$ v) $$-5\frac{7}{12} + (-2\frac{3}{4}) = -\frac{67}{12} - \frac{11}{4} = -\frac{67}{12} - \frac{33}{12} = -\frac{100}{12} = -\frac{25}{3} = -8\frac{1}{3}$$ г) $$-3\frac{4}{9} + (-8\frac{5}{6}) = -\frac{31}{9} - \frac{53}{6} = -\frac{62}{18} - \frac{159}{18} = -\frac{221}{18} = -12\frac{5}{18}$$ д) $$-5\frac{12}{17} + (-1\frac{15}{24}) = -\frac{97}{17} - \frac{39}{24} = -\frac{97}{17} - \frac{13}{8} = -\frac{776}{136} - \frac{221}{136} = -\frac{997}{136} = -7\frac{45}{136}$$ e) $$- \frac{9}{28} + (-4\frac{9}{35}) = -\frac{9}{28} - \frac{149}{35} = -\frac{45}{140} - \frac{596}{140} = -\frac{641}{140} = -4\frac{81}{140}$$