(2 1/2)в кубе × 8/15 - 5/9

Question

(2 1/2)в кубе × 8/15 - 5/9

Answer 1

2 и 1/2=5/2
(5/2)^3 х 8/15 - 5/9 = (5х5х5) / (2х2х2) х8/15 - 5/9= (5х5х5х8) /(8х3х5)-5/9=
=25/3-5/9= 8и1/3 - 5/9 = 8и3/9 - 5/9= 7и7/9