a=[......] b=[......]+2 c=[........]+2+2 (numere comsecitive pare) 900-720(suma d+e)=180(suma a+b+c) 180-2-2-2=174(spe) 174%3=58 a=58 b=58+2=60 c=58+2+2=62 d=[..........] e=[...........][...........]+120 (dublul lui d +120) 720(d+e)-120=600(spe) 600%3=200 d=200 e=200+200+120=520 verificare=a+b+c+d+e=58+60+62+200+520=900