Пошаговое объяснение:

Вот, во вложении решение

a) 3 2/3-7/15+4 2/5×1/3=

11/3-7/15+4 2/5×1/3=

55/15-7/15+4 2/5×1/3=

48/15+4 2/5×1/3=

48/15+22/15×1/3

48/15+22/45

144/45+22/45=166/45=3 31/45

b)4 1/2×8/9-5 1/3:10 2/3=

9/2×8/9-16/3:32/3=

72/18-16/3:32/3=

72/18-96/18:192:18=

72/18-0,5=

4-0,5=3,5