2.398 Вычислите: a) \(\left(4\frac{3}{4} - 3\frac{1}{12}\right) \cdot 4\);

a) \(\left(4\frac{3}{4} - 3\frac{1}{12}\right) \cdot 4\);

1. \(4\frac{3}{4} - 3\frac{1}{12} = 4\frac{9}{12} - 3\frac{1}{12} = 1\frac{8}{12} = 1\frac{2}{3}\)
2. \(1\frac{2}{3} = \frac{1 \cdot 3 + 2}{3} = \frac{3 + 2}{3} = \frac{5}{3}\)
3. \(\frac{5}{3} \cdot 4 = \frac{5 \cdot 4}{3} = \frac{20}{3} = 6\frac{2}{3}\)

Ответ: \(6\frac{2}{3}\)