Cho các giới hạn: \(\mathop {\lim }\limits_{x \to {x_0}} f\left( x \right) = 2\); \(\mathop {\lim }\limits_{x \to {x_0}} g\left( x \right) = - 3\), hỏi \(\mathop {\lim }\limits_{x \to {x_0}} \left[ {f\left( x \right) + g\left( x \right)} \right]\) bằng