Câu 12:
Biết limx→2f(x)=3.\mathop {\lim }\limits_{x \to 2} f(x) = 3.x→2limf(x)=3.Tính limx→2[f(x)+x].\mathop {\lim }\limits_{x \to 2} \left[ {f\left( x \right) + x} \right].x→2lim[f(x)+x].
