Question

помогите, пожалуйста​

Answer 1

$- 3.2 {a}^{2} {b}^{3} = - 3.2 \times {( \frac{1}{2} )}^{2} \times {( - 1)}^{3} = - \frac{16}{5} \times \frac{1}{4} \times ( - 1) = \frac{4}{5} = 0.8$