Răspuns:
Explicație pas cu pas:
x/y = 1,5 = 15/10 = 3/2
y/x = 2/3
3*x/5*y = 3/5*3/2 = 9/10
2*x/3*y = 2/3*3/2 = 1
2*y/3*x = 2/3*2/3 = 4/9
_________
x = 3y/2
x + y = 3y/2 + y = 5y/2
x - y = 3y/2 - y = y/2
(x + y)/(x - y) = 5y/2 : y/2 = 5
