Răspunsuri

  • Utilizator Brainly
2014-07-25T12:07:31+03:00
A+b=5 /*2⇒2a+2b       =10
b+c=7 /*3⇒      3b+3c =21 adunam si obtinem
                  2a+5b+3c  =31
12 3 12