Răspunsuri

2014-03-24T11:16:24+02:00
6/x=x/6
x^2=36
x=rad 36
x=6

5x/4=15/x
5x^2=60
x^2=12
x=rad 12
x=2rad3

(x+5)^2=25
x+5=rad 25
x+5=5
x=5-5
x=0