Răspuns:
Explicație pas cu pas:
x/(x^2 + 3x) = x/x(x + 3) = 1/(x + 3)
1/(x - 3) - 1/(x + 3) = [x + 3 - (x - 3)]/(x - 3)(x + 3) = (x + 3 - x + 3)/(x + 3)(x - 3)
= 6/(x + 3)(x - 3)
6/(x + 3)(x - 3) : 6/(x - 3) = 6/(x + 3)(x - 3) * (x - 3)/6 = 1/(x + 3)
E(x) = 1/(x + 3) - 1/(x + 3) = 0
