Question

даю 20 баллов!!!!!!!!!!!!!!!!!!

Answer 1

Пошаговое объяснение:

$8.7b - 2.3b - 1.8b - 2.66 = 7 \\ 1)8.7b - 2.3b - 1.8b = 4.6b \\ 2)4.6 \times 2.1 = 9.66 \\ 3)9.66 - 2.66 = 7$