(4.8+7/8)-(3/4+0.5)-1/5
4.8+(7/8-3/4)+0.5-1/5
4.8+{(7/8-3/4)+(0.5-1/5 )}
4.8+(7/8-3/4)+(0.5-1/5 )
(4.8+7/8)-3/4+(0.5-1/5)