Răspunsuri

2014-03-24T20:06:13+02:00
2014-03-24T20:06:20+02:00
Notam numarul cu x.
x/5=x/3-2
2=x/3-x/5
2=5x/15-3x/15
2=2x/15
2x=2*15
2x=30 => x=30/2  => x=15