в) \(6 \frac{7}{12} - 1 \frac{3}{12} = (6 - 1) + (\frac{7}{12} - \frac{3}{12}) = 5 + \frac{7-3}{12} = 5 + \frac{4}{12} = 5 + \frac{4 \cdot 1}{4 \cdot 3} = 5 + \frac{1}{3} = 5 \frac{1}{3}\)
Ответ: \(5 \frac{1}{3}\)