Question

Fie expresia E(x) = $\frac{x-3}{x+3}$ · ($\frac{1}{x-3}$ - $\frac{1}{x+3}$ ) : $(x+3)^{-2}$

a) Determinati multimea A = { x ∈ R ; E(x) are sens }
b) Aratati ca expresia E(x) are valoarea constanta , oricare ar fi x ∈ A.

Answer 1

Răspuns:

x+3≠0;   x≠-3 ;  x-3≠0   ;   x≠3  ;      [1/(x+3)- 1/(x+3)]:1/(x+3)²=0

Explicație pas cu pas: