(6,39-2,1028):(18-5,3408-11,3022:1,35)=
6,39 - 2,1028) : (18 - 5.3408 - 11.3022 : 1.35) = 1 1) 6.39 - 2.1028 = 4.2872 2) 11.3022 : 1.35 = 8.372 3) 18 - 5.3408 = 12.6592 4) 12.6592 - 8.372 = 4.2872 5) 4.2872 : 4.2872 = 1