Tính các giới hạn sau: lim ((-2n^2 - n + 2) / (8n^2 - 5n + 4))
Tính các giới hạn sau:
\(\lim \frac{{ - 2{n^2} - 6n + 2}}{{8{n^2} - 5n + 4}}\);
\(\lim \frac{{ - 2{n^2} - 6n + 2}}{{8{n^2} - 5n + 4}}\)\( = \lim \frac{{{n^2}\left( { - 2 - \frac{6}{n} + \frac{2}{{{n^2}}}} \right)}}{{{n^2}\left( {8 - \frac{5}{n} + \frac{4}{{{n^2}}}} \right)}}\)
\( = \lim \frac{{ - 2 - \frac{6}{n} + \frac{2}{{{n^2}}}}}{{8 - \frac{5}{n} + \frac{4}{{{n^2}}}}} = \frac{{\lim \left( { - 2 - \frac{6}{n} + \frac{2}{{{n^2}}}} \right)}}{{\lim \left( {8 - \frac{5}{n} + \frac{4}{{{n^2}}}} \right)}} = \frac{{ - 2}}{8} = - \frac{1}{4}\).