2) (1-3).19

2) $$(1 \frac{1}{4} - \frac{3}{19}) \cdot 19 = (\frac{1 \cdot 4 + 1}{4} - \frac{3}{19}) \cdot 19 = (\frac{5}{4} - \frac{3}{19}) \cdot 19 = (\frac{5 \cdot 19}{4 \cdot 19} - \frac{3 \cdot 4}{19 \cdot 4}) \cdot 19 = (\frac{95}{76} - \frac{12}{76}) \cdot 19 = \frac{83}{76} \cdot 19 = \frac{83 \cdot 19}{4 \cdot 19} = \frac{83}{4} = 20,75$$

Ответ: 20,75