Elaelena2010 Elaelena2010 08-10-2015 Matematică a fost răspuns (261-b):2-31=89 (261-b):2=89+31 (261-b):2=120 261-b=120x2 261-b=240 b=261-240 b=21 (261-21):2-31=240:2-31=120-31=89
