Răspuns :
x/y=2/3
(3x+y)/(x-y) =
=(3x/y+1)/(x/y-1)=
=(3×2/3+1)/(2/3-1)=
=(2+1)/(2/3-3/3)=
=3/(-1/3)=-1
(3x+y)/(x-y) =
=(3x/y+1)/(x/y-1)=
=(3×2/3+1)/(2/3-1)=
=(2+1)/(2/3-3/3)=
=3/(-1/3)=-1