Răspuns:
Explicație pas cu pas:
5) (2*2x - (2x +1)*2)/(4x^2) = -2/(4x^2)= -1/(2x^2)
6) (6x(x+1) -(3x^2 +2)*1)/(x+1)^2 =
(3x^2 +6x -2)/(x+1)^2
7) (3(x^2 +2x) - (3x+9)(2x +2))/(x^2 +2x)^2 =
(3x^2 +6x -6x^2 -6x -18x -18))/(x^2 +2x)^2 =
(-3x^2 -18x -18))/(x^2 +2x)^2
