ГДЗ Математика 6 клас Істер — Вправа 265

1) $\frac{5}{48} + \frac{3}{8} + \frac{1}{48} = (\frac{5}{48} + \frac{1}{48}) + \frac{3}{8} = \frac{6}{48} + \frac{3}{8} =$

$= \frac{1}{8} + \frac{3}{8} = \frac{4}{8} = \frac{1}{2};$

2) $\frac{5}{18} + \frac{7}{24} + \frac{1}{18} + \frac{5}{24} = (\frac{5}{18} + \frac{1}{18}) + (\frac{7}{24} + \frac{5}{24}) =$

$= \frac{6}{18} + \frac{12}{24} = \frac{1}{3} + \frac{1}{2} = \frac{2}{6} + \frac{3}{6} = \frac{5}{6};$

3) $(\frac{7}{15} + \frac{2}{9}) - \frac{2}{15} = (\frac{7}{15} - \frac{2}{15}) + \frac{2}{9} = \frac{5}{15} + \frac{2}{9} =$

$= \frac{1}{3} + \frac{2}{9} = \frac{3}{9} + \frac{2}{9} = \frac{5}{9};$

4) $\frac{14}{27} - (\frac{5}{27} + \frac{1}{6}) = (\frac{14}{27} - \frac{5}{27}) - \frac{1}{6} = \frac{9}{27} - \frac{1}{6} =$

$= \frac{1}{3} - \frac{1}{6} = \frac{2}{6} - \frac{1}{6} = \frac{1}{6}.$