Пошаговое объяснение:

2 5/8 · b + 3 1/4 · b

При b = 2 2/3

2 5/8 · 2 2/3 + 3 1/4 · 2 2/3 = 7 + 8 2/3 = 15 2/3

1) 2 5/8 · 2 2/3 = 21/8 · 8/3 = 21·8/8·3 = 7/1 = 7

2) 3 1/4 · 2 2/3 = 13/4 · 8/3 = 13·8/4·3 = 26/3 = 8 2/3

3) 7 + 8 2/3 = 15 2/3