Răspuns:
a)7943-1632= 6311
~Verificare:
1. 6311+1632=7943
2. 7943-6311=1632
•7932-4947=2985
~Verificare
1.2985+4947=7932
2.7932-2985=4947
b)18000-1908 =16,092
~Verificare
1. 16,092+1908=18000
2. 18000-16092=1908
c)69400-17800=51600
~Verificare
1. 51600+17800=69400
2.69400-51600=17800
c) 72415-24985=47,430
~Verificare
1.47,430+24985=72415
2. 72415-47430=24985