Răspunsuri

  • Utilizator Brainly
2014-04-28T13:06:44+03:00
3(a+b)=270
a-b=4⇒a=b+4
3a+3b=270⇒a+b=90
b+4+b=90
2b=96   b=43
a+43=90    a=47

Verificare : 3(47+43)=270
                   47-43=4