Răspunsuri

  • Utilizator Brainly
2014-05-13T19:41:36+03:00
A).x:3=-3
x=-3·3
x=-9
b).(x+1)²=9
(x+1-3)·(x+1+3)=0
x-2=0   x+4=0
x=2      x=-4
c).x/5=x+1/5
amplifici pe x de la x+1/5 cu 5
si vine 
x=5x+1
x-5x=1
-4x=1
x=1/4