2.398 Вычислите: a) (4−3)⋅4;

a) $$\left(4 \frac{3}{4} - 3 \frac{1}{12}\right) \cdot 4 = \left(\frac{19}{4} - \frac{37}{12}\right) \cdot 4 = \left(\frac{19 \cdot 3}{4 \cdot 3} - \frac{37}{12}\right) \cdot 4 = \left(\frac{57}{12} - \frac{37}{12}\right) \cdot 4 = \frac{20}{12} \cdot 4 = \frac{5}{3} \cdot 4 = \frac{20}{3} = 6 \frac{2}{3}$$ Ответ: $$6 \frac{2}{3}$$