Question

.помогите ето га 19.30​

Answer 1

$- 25a \times 0.4b = - 10ab = \\ = - 10 \times 1 \frac{1}{15} \times ( - 2 \frac{1}{2} ) = \\ \\ = \frac{10 \times 16 \times 5}{15 \times 2} = \frac{80}{3} = 26 \frac{2}{3}$