Задание 220 Вариант 3 Самостоятельная работа ГДЗ Дидактические материалы Чесноков 5 класс (Математика)

а) $$4\frac{14}{19}-2\frac{5}{19}=(4-2)+\left(\frac{14}{19}-\frac{5}{19}\right)=2+\frac{9}{19}=2\frac{9}{19};$$

б) $$8\frac{7}{10}-5=(8-5)+\frac{7}{10}=3\frac{7}{10};$$

в) $$12-\frac{7}{18}=11\frac{18}{18}-\frac{7}{18}=11+\left(\frac{18}{18}-\frac{7}{18}\right)=11+\frac{11}{18}=11\frac{11}{18};$$

г) $$11-3\frac{5}{12}=10\frac{12}{12}-3\frac{5}{12}=(10-3)+\left(\frac{12}{12}-\frac{5}{12}\right)=7+\frac{7}{12}=7\frac{7}{12};$$

д) $$8\frac{7}{15}-3\frac{11}{15}=7\frac{22}{15}-3\frac{11}{15}=(7-3)+\left(\frac{22}{15}-\frac{11}{15}\right)=4+\frac{11}{15}=4\frac{11}{15};$$

е) $$10\frac{9}{14}-3\frac{9}{14}=(10-3)+\left(\frac{9}{14}-\frac{9}{14}\right)=7+0=7.$$