Giải:

$\mathop {\lim }\limits_{x \to + \infty } ({x^4} – {x^2} + x – 1)=\mathop {\lim }\limits_{x \to + \infty } {x^4}\left( {1 – \frac{1}{{{x^2}}} + \frac{1}{{{x^3}}} – \frac{1}{{{x^4}}}} \right)= + \infty $

 


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