19. -(\(\frac{40}{-20} - \frac{15}{5} + \frac{46}{-23}\) \(\frac{19}{19}\))

Решение:

\( -\left( \frac{40}{-20} - \frac{15}{5} + \frac{46}{-23} \right) \cdot \frac{19}{19} = -\left( -2 - 3 + (-2) \right) \cdot 1 = -\left( -5 - 2 \right) \cdot 1 = -\left( -7 \right) \cdot 1 = 7 \)

Ответ: 7