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a+b+c=390. a+b=245. b+c=279 DAU COROANA!

Răspuns :

a+b+c=390
a+b=245
b+c=279

a+b+c=390
245+c=390
c=390-245
c=145

b+c=279
b+145=279
b=279-145
b=134

a+b=245
a+134=245
a=245-134
a=111

Proba:

a+b+c=390
111+134+145=390 "A"