Виконай дії:
Розв'язок:
1) $-\frac{11}{36} + \left(-\frac{17}{24}\right) = -\left(\frac{11}{36} + \frac{17}{24}\right) =$
$= -\frac{22+51}{72} = -\frac{73}{72} = -1\frac{1}{72}$;
2) $\frac{7}{10} + \left(-\frac{13}{15}\right) = \frac{7}{10} - \frac{13}{15} =$
$= \frac{21-26}{30} = -\frac{5}{30} = -\frac{1}{6}$;
3) $-\frac{2}{9} - \frac{5}{18} = -\left(\frac{2}{9} + \frac{5}{18}\right) =$
$= -\frac{4+5}{18} = -\frac{9}{18} = -\frac{1}{2}$;
4) $-\frac{1}{3} - \left(-\frac{5}{6}\right) = -\frac{1}{3} + \frac{5}{6} =$
$= \frac{5-2}{6} = \frac{3}{6} = \frac{1}{2}$.