a) \(\frac{16}{23} - \frac{12}{23} + \frac{3}{23} = \frac{16 - 12 + 3}{23} = \frac{7}{23}\)
б) \(2 \frac{5}{11} + 6 \frac{7}{11} = (2 + 6) + (\frac{5}{11} + \frac{7}{11}) = 8 + \frac{12}{11} = 8 + 1 \frac{1}{11} = 9 \frac{1}{11}\)
в) \(7 - 4 \frac{4}{5} = 6 \frac{5}{5} - 4 \frac{4}{5} = (6 - 4) + (\frac{5}{5} - \frac{4}{5}) = 2 \frac{1}{5}\)
г) \(5 \frac{4}{13} - 3 \frac{9}{13} = 4 \frac{17}{13} - 3 \frac{9}{13} = (4 - 3) + (\frac{17}{13} - \frac{9}{13}) = 1 + \frac{8}{13} = 1 \frac{8}{13}\)