Răspunsuri

2014-11-13T15:10:13+02:00
2014-11-13T15:11:36+02:00
A-b= 12
a=3b 
3b-b=12
2b=12⇒ b=12/2⇒ b=6
a-6 = 12⇒ a = 12+6⇒a= 18