Решение задания 2.247

a) $$1 - \frac{4}{17} = \frac{17}{17} - \frac{4}{17} = \frac{17-4}{17} = \frac{13}{17}$$

б) $$5 - \frac{7}{13} = \frac{5*13}{13} - \frac{7}{13} = \frac{65}{13} - \frac{7}{13} = \frac{65-7}{13} = \frac{58}{13} = 4\frac{6}{13}$$

в) $$6 - 5\frac{6}{11} = 6 - \frac{5*11+6}{11} = 6 - \frac{55+6}{11} = 6 - \frac{61}{11} = \frac{6*11}{11} - \frac{61}{11} = \frac{66}{11} - \frac{61}{11} = \frac{66-61}{11} = \frac{5}{11}$$

г) $$4\frac{5}{9} - 3 = (4-3) + \frac{5}{9} = 1 + \frac{5}{9} = 1\frac{5}{9}$$