Question

fie y/x=3/6.Determinati Valoarea expresiei x+y/x-y

Answer 1

$\frac{y}{x} = \frac{3}{6} \\ \\ 6y=3x / :3 \\ \\ 2y=x \\ \\ x=2y \\ \\ \frac{x+y}{x-y} = \frac{2y+y}{2y-y} = \frac{3y}{y} =3$

Answer 2

       y / x = 3 / 6     
         ( Folosesc proprietatile proportiilor derivate cu termeni schimbati !)

=>   (x+y) / (x-y) = (6+3) / (6-3) = 9 / 3 = 3 ;