Cho hàm số \(f\left( x \right) = \left\{ \begin{ar...

Câu hỏi: Cho hàm số \(f\left( x \right) = \left\{ \begin{array}{l}\frac{{\sqrt {x + 4}  - 1}}{{x - 1}}\,\,\,khi\,\,\,x > 4\\3 - x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\,\,x \le 4\end{array} \right..\) Tính f (5) + f (–5).

A \( - \frac{3}{2}\)                 

B \(\frac{{15}}{2}\)

C \(\frac{{17}}{2}\)     

D \(-\frac{{5}}{2}\)