Răspunsuri

2014-03-12T08:15:22+02:00
X+y=20      x/100/25=y/9/3=k        x=100/25k  y=9/3k     simplificam si avem  x=4k      y=3k    inlocuiesti in formula si obtii k      4k+3k=20    7k=20  k=20;7