Răspuns :
123+451+240=814
1450-814=636
636:3=212(numarul care se scade)
(212+123)+(212+451)+(212+240)=1450
1450-814=636
636:3=212(numarul care se scade)
(212+123)+(212+451)+(212+240)=1450
a+b+c=1450
a-x=123
b-x=451
c-x=240
123+521+240+3x=1450
3x= 636=> x=212
a=335
b=663
c=452