5.281 Вычислите: ж) 5 4/7 - 1 5/7 з) 4 8/15 - 2 13/15

ж) $$5\frac{4}{7} - 1\frac{5}{7} = (5-1) + \frac{4}{7} - \frac{5}{7} = 4 - \frac{1}{7} = 3 + 1 - \frac{1}{7} = 3 + \frac{7}{7} - \frac{1}{7} = 3 + \frac{6}{7} = 3\frac{6}{7}$$; з) $$4\frac{8}{15} - 2\frac{13}{15} = (4-2) + \frac{8}{15} - \frac{13}{15} = 2 - \frac{5}{15} = 1 + 1 - \frac{5}{15} = 1 + \frac{15}{15} - \frac{5}{15} = 1 + \frac{10}{15} = 1 + \frac{2}{3} = 1\frac{2}{3}$$