Răspunsuri

2014-11-12T18:43:56+02:00
3a + 5b + 2c =3(54-b) + 5b + 2(56-b)= 162 -3b + 5b + 112 -2b = 274
a + b=54 =>a= 54 -b
b + c=56 => c=56 -b