Question

Помогите пожалуйста, сделайте.

Answer 1

Б)

$( - 2.8 + 6.1 - 3.4 + 6.2) \times ( - 3.4) = \\ = - 20.74$

$- 2.8 + 6.1 = 3.3 - 3.4 = - 0.1 \\ - 0.1 + 6.2 = 6.1$

$6.1 \times ( - 3.4) = - 20.74$

В)

$(4.3 - 7.8) \times ( - 5.6 + 8.3) = \\ = - 9.45 \\ 1)4.3 - 7.8 = -3.5 \\ 2) - 5.6 + 8.3 = 2.7 \\ 3) - 3.5 \times 2.7 = - 9.45$

$3) - 3.5 \times 2.7 = - 9.45$