Tính các giới hạn sau:

\(\lim \left( {6 - \frac{5}{{{4^n}}}} \right)\).

\(\lim \left( {6 - \frac{5}{{{4^n}}}} \right)\)\( = \lim 6 - \lim \frac{5}{{{4^n}}}\)\( = 6 - \lim \left( {5.\frac{1}{{{4^n}}}} \right)\)

\( = 6 - 5\lim {\left( {\frac{1}{4}} \right)^n} = 6 - 5.0 = 6\).