ГДЗ Математика 6 клас Істер — Вправа 278

1) $1\frac{4}{9} + 3\frac{2}{7} = 4 + (\frac{28}{63} + \frac{18}{63}) = 4\frac{46}{63};$

2) $7\frac{5}{12} + 1\frac{3}{8} = 8 + (\frac{10}{24} + \frac{9}{24}) = 8\frac{19}{24};$

3) $8\frac{7}{20} + 4\frac{19}{30} = 12 + (\frac{21}{60} + \frac{38}{60}) = 12\frac{59}{60};$

4) $7\frac{2}{25} + 1\frac{7}{15} = 8 + (\frac{6}{75} + \frac{35}{75}) = 8\frac{41}{75}.$