Răspuns:
Explicație pas cu pas:
(5x(1+x) -2x(1+2x))/(2x*5x) =
(5x +5x^2) -2x -4x^2)/(2x*5x) =
(x^2 +3x)/(2x*5x) =
(x+3)*x/(2x*5x) =
(x+3)/10x
(x+3)/10x*10x/(x+3) = 1
