Răspuns :
a+2,506=78,937
a= 78,937-2,506
a= 76,431
proba: 76,431+2,506=78,937
b-567=1,212
b= 1,212+567
b=1,779
proba: 1,779-567=1,212
36,724-c=12,504
c= 36,724-12,504
c= 24,220
proba: 36,724-24,220= 12,504
a= 78,937-2,506
a= 76,431
proba: 76,431+2,506=78,937
b-567=1,212
b= 1,212+567
b=1,779
proba: 1,779-567=1,212
36,724-c=12,504
c= 36,724-12,504
c= 24,220
proba: 36,724-24,220= 12,504