Răspuns :
a+b+c=938
a+b=931⇒a=931-b
b+c=8⇒c=8-b
931-b+b+8-b=938
939-b=938
-b=938-939⇒b=1
a=931-1⇒a=930
c=8-938⇒c=-930
930+1+(-930)=938 A
a+b=931⇒a=931-b
b+c=8⇒c=8-b
931-b+b+8-b=938
939-b=938
-b=938-939⇒b=1
a=931-1⇒a=930
c=8-938⇒c=-930
930+1+(-930)=938 A