Решаем:
a) 1 - \frac{4}{9} = \frac{9}{9} - \frac{4}{9} = \frac{5}{9}
б) 5 - \frac{2}{3} = 4 \frac{3}{3} - \frac{2}{3} = 4 \frac{1}{3}
в) 7 - 2 \frac{3}{8} = 6 \frac{8}{8} - 2 \frac{3}{8} = 4 \frac{5}{8}
г) 3 \frac{2}{5} - \frac{4}{5} = 2 \frac{7}{5} - \frac{4}{5} = 2 \frac{3}{5}
д) 4 \frac{1}{6} - 1 \frac{5}{6} = 3 \frac{7}{6} - 1 \frac{5}{6} = 2 \frac{2}{6} = 2 \frac{1}{3}
e) 6 \frac{6}{15} - 2 \frac{9}{15} = 5 \frac{21}{15} - 2 \frac{9}{15} = 3 \frac{12}{15} = 3 \frac{4}{5}