K-4, Вариант III, №1. Вычислите: a) \(\frac{4}{5} + (-\frac{8}{15})\) b) \(-\frac{5}{8} - \frac{7}{12}\) v) \(-\frac{12}{35} \cdot \frac{15}{16}\) g) \(\frac{13}{28} : (-\frac{11}{14})\)

a) \(\frac{4}{5} + (-\frac{8}{15}) = \frac{12}{15} - \frac{8}{15} = \frac{4}{15}\) b) \(-\frac{5}{8} - \frac{7}{12} = -\frac{15}{24} - \frac{14}{24} = -\frac{29}{24} = -1\frac{5}{24}\) v) \(-\frac{12}{35} \cdot \frac{15}{16} = -\frac{3 \cdot 4}{7 \cdot 5} \cdot \frac{3 \cdot 5}{4 \cdot 4} = -\frac{3 \cdot 3}{7 \cdot 4} = -\frac{9}{28}\) g) \(\frac{13}{28} : (-\frac{11}{14}) = \frac{13}{28} \cdot (-\frac{14}{11}) = -\frac{13 \cdot 14}{28 \cdot 11} = -\frac{13}{2 \cdot 11} = -\frac{13}{22}\)