Răspuns:
Explicație pas cu pas:
x/y = 1/4 ⇒ x = y/4
2x + y = 2y/4 + y = y/2 + y = y/2 + 2y/2 = 3y/2
5x - y = 5y/4 - y = 5y/4 - 4y/4 = y/4
(2x + y)/(5x - y) = (3y/2) / (y/4) = 12/2 = 6
x/q=1/4=> q=4x
E= (2x+q)/ (5x-q)=> E= (2x+4x)/( 5x-4x)= 6x/x (se simplifica cu x)=6
