А) 2 целые 5/18 - 5/6 б) 3 целые 2/5 - 11/15
в) 1 целая 4/5 - 9/10 г) 7/24 + 5/24 д) 17/18 - 5/18

А) $2 frac{5}{18} - frac{5}{6} = frac{41}{18} - frac{5}{6} = frac{41}{18} - frac{15}{18} = frac{26}{18} = frac{13}{9} = 1 frac{4}{9}$
б) $3 frac{2}{5} - frac{11}{15} = frac{17}{5} - frac{11}{15} = frac{51}{15} - frac{11}{15} = frac{40}{15} = frac{8}{3} = 2 frac{2}{3}$
в) $1 frac{4}{5} - frac{9}{10} = frac{9}{5} - frac{9}{10} = frac{18}{10} - frac{9}{10} = frac{9}{10} = 0,9$
г) $frac{7}{24} + frac{5}{24} = frac{12}{24} = frac{1}{2} = 0,5$
д) $frac{17}{18} - frac{5}{18} = frac{12}{18} = frac{6}{9} = frac{2}{3}$