Tính \(\mathop {\lim }\limits_{x \to 2} \left( {\frac{1}{{{x^2} - 3x + 2}} + \frac{1}{{{x^2} - 5x + 6}}} \right)\)

Câu hỏi :

Tính \(\mathop {\lim }\limits_{x \to 2} \left( {\frac{1}{{{x^2} - 3x + 2}} + \frac{1}{{{x^2} - 5x + 6}}} \right)\)