(2.4/9+1.1/6)*1.4/5-3.1/9:2.1/3
(2.4/9+1.1/6)*1.4/5-3.1/9:2.1/3 = (22/9+7/6)*9/5-28/9:7/3 =
(44/18+21/18)*9/5-28/9*3/7=65/18*9/5-28/9*3/7 =13/2 - 4/3=39/6 - 8/6=31/6 =5.1/6