- 0,23 + ( 5,3 - 6.77 )=- 0,23 + ( -1,47) = - 0,23 -1,47 = -1,7
- 19,47 - ( - 20,69 - 3,32 )= - 19,47 - ( - 24,01) = - 19,47 + 24,01 = 24,01 -19,47= 4,54
18.17/39 - ( 7.1/2 - 4.22/39 )= 18.17/39 - 7.1/2 + 4.22/39 = 18.17/39 +4.22/39 - 7.1/2 = 22.39/39 - 7.1/2 = 23 -7.1/2 = 22.2/2-7.1/2=15.1/2