3 5/9.
Пошаговое объяснение:
(12а+b)×2/3с
Если a = 5/18, b = 2/3, c = 1 1/3, то
(12•5/18 + 2/3)•2/3•4/3 = 3 5/9.
1) 12•5/18 = 2•5/3 = 10/3 = 3 1/3;
2) 3 1/3 + 2/3 = 4;
3) 4•2/3•4/3 = 32/9 = 3 5/9.
