1) 14,9 - 3,89 = 14,90 - 3,89 = 11,1
2) 18 - y = 4,15
- y = 4,15 - 18
- y = - 13,85
y = 13,85
3) 12 (3/5) + 7,677 - 4 (3/8) = 12,6 + 7,677 - 4,375 = 12,600 + 7,677 - 4,375 = 20,277 - 4,375 = 15,902
4) 27,34b + 8,3b - 3,069b = 27,340b + 8,300b - 3,069b = 35,640b - 3,069b = 32,571
5) 600 - 214,15 - (34,7 - 3,637) = 385,85 - (34,700 - 3,637) = 385,850 - 31,063 = 354,787