Как решить? помогите! прошу! номер 280.

А) $frac{1}{2} + frac{3}{7} = frac{7}{14} + frac{6}{14} = frac{13}{14}$

$frac{1}{3} + frac{1}{8} = frac{8}{24} + frac{3}{24} = frac{11}{24}$

$frac{5}{6} + frac{1}{3} = frac{5}{6} + frac{2}{6} = frac{7}{6}= 1 frac{1}{6}$

б) $frac{5}{24} + frac{5}{6} = frac{5}{24} + frac{20}{24} = 1 frac{1}{24}$

$frac{1}{4} + frac{1}{6} = frac{3}{12} + frac{2}{12} = frac{5}{12}$

$frac{1}{6} + frac{2}{9} = frac{6}{36} + frac{8}{36} = frac{14}{36} = frac{7}{18}$