\(\mathop {\lim }\limits_{x...

C

- Hướng dẫn giải

\(\mathop {\lim }\limits_{x \to  + \infty } \frac{{3{x^4} - 2x + 3}}{{5{x^4} + 3x + 1}} = \mathop {\lim }\limits_{x \to  + \infty } \frac{{{x^4}\left( {3 - \frac{2}{{{x^3}}} + \frac{3}{{{x^4}}}} \right)}}{{{x^4}\left( {5 + \frac{3}{{{x^3}}} + \frac{1}{{{x^4}}}} \right)}} = \frac{3}{5}\)