Tính các giới hạn sau: lim ((-4n^2 - 3) / (2n^2 - n + 5))
Tính các giới hạn sau:
\(\lim \frac{{ - 4{n^2} - 3}}{{2{n^2} - n + 5}}\);
\(\lim \frac{{ - 4{n^2} - 3}}{{2{n^2} - n + 5}}\)\( = \lim \frac{{{n^2}\left( { - 4 - \frac{3}{{{n^2}}}} \right)}}{{{n^2}\left( {2 - \frac{1}{n} + \frac{5}{{{n^2}}}} \right)}}\)\( = \lim \frac{{ - 4 - \frac{3}{{{n^2}}}}}{{2 - \frac{1}{n} + \frac{5}{{{n^2}}}}}\)
\( = \frac{{\lim \left( { - 4 - \frac{3}{{{n^2}}}} \right)}}{{\lim \left( {2 - \frac{1}{n} + \frac{5}{{{n^2}}}} \right)}}\)\( = \frac{{ - 4}}{2} = - 2\).