ГДЗ Математика 6 клас Істер — Вправа 277

1) $3\frac{3}{8} + 2\frac{5}{12} = 5 + (\frac{9}{24} + \frac{10}{24}) = 5\frac{19}{24};$

2) $7\frac{9}{14} + 2\frac{4}{21} = 9 + (\frac{27}{42} + \frac{8}{42}) = 9\frac{35}{42} = 9\frac{5}{6};$

3) $4\frac{2}{15} + 7\frac{5}{12} = 11 + (\frac{8}{60} + \frac{25}{60}) = 11\frac{33}{60} = 11\frac{11}{20};$

4) $7\frac{4}{35} + 2\frac{5}{14} = 9 + (\frac{8}{70} + \frac{25}{70}) = 9\frac{33}{70}.$