Ответ:

Решение:

\( -\frac{4}{5} - 2,7 \cdot \left( -1\frac{2}{3} \right) \)

  1. \( 2,7 = \frac{27}{10} \)
  2. \( -1\frac{2}{3} = -\frac{5}{3} \)
  3. \( -\frac{4}{5} - \frac{27}{10} \cdot \left( -\frac{5}{3} \right) = -\frac{4}{5} + \frac{27}{10} \cdot \frac{5}{3} \)
  4. \( \frac{27}{10} \cdot \frac{5}{3} = \frac{27 \cdot 5}{10 \cdot 3} = \frac{(9 \cdot 3) \cdot 5}{(2 \cdot 5) \cdot 3} = \frac{9}{2} \)
  5. \( -\frac{4}{5} + \frac{9}{2} = \frac{-8 + 45}{10} = \frac{37}{10} = 3,7 \)

Ответ: 3,7.