223. Выполните действия: a) (7 5/14 + 2 9/14) - 3 5/14; б) 12 2/5 - (9 1/2 + 1 5/8)

a) \((7 \frac{5}{14} + 2 \frac{9}{14}) - 3 \frac{5}{14}\) = \(9 \frac{14}{14} - 3 \frac{5}{14}\) = \(10 - 3 \frac{5}{14}\) = \(6 \frac{9}{14}\) б) \(12 \frac{2}{5} - (9 \frac{1}{2} + 1 \frac{5}{8})\) = \(12 \frac{2}{5} - (\frac{19}{2} + \frac{13}{8})\) = \(12 \frac{2}{5} - (\frac{76}{8} + \frac{13}{8})\) = \(12 \frac{2}{5} - \frac{89}{8}\) = \(12 \frac{16}{40} - 11 \frac{1}{8}\) = \(\frac{616}{40} - \frac{445}{40}\) = \(\frac{171}{40}\) = \(4 \frac{11}{40}\)