е) \[ 14.2 \cdot \frac{5}{9} - 12.4 \cdot \frac{5}{9} = \frac{5}{9} \cdot (14.2 - 12.4) = \frac{5}{9} \cdot 1.8 = \frac{5 \cdot 1.8}{9} = \frac{5 \cdot 18}{9 \cdot 10} = \frac{5 \cdot 2}{10} = \frac{10}{10} = 1 \]
Ответ:
\[ 1 \]