5.300 Найдите разность: a) 13 8/9 - 4; б) 17 5/14 - 5 3/14; в) 9 5/7 - 3 6/7

a) (13\frac{8}{9} - 4 = 13 - 4 + \frac{8}{9} = 9 + \frac{8}{9} = 9\frac{8}{9}) б) (17\frac{5}{14} - 5\frac{3}{14} = 17 - 5 + \frac{5}{14} - \frac{3}{14} = 12 + \frac{2}{14} = 12\frac{1}{7}) в) (9\frac{5}{7} - 3\frac{6}{7} = 8\frac{12}{7} - 3\frac{6}{7} = 8 - 3 + \frac{12}{7} - \frac{6}{7} = 5 + \frac{6}{7} = 5\frac{6}{7})