Tính lim (2^ n + 1)/( 2.2 n + 3) .
Giải thích
Chọn D
Ta có: \(\lim \frac{{{2^n} + 1}}{{{{2.2}^n} + 3}} = \lim \frac{{1 + {{\left( {\frac{1}{2}} \right)}^n}}}{{2 + 3.{{\left( {\frac{1}{2}} \right)}^n}}} = \frac{{1 + 0}}{{2 + 0}} = \frac{1}{2}\)
Chọn D
Ta có: \(\lim \frac{{{2^n} + 1}}{{{{2.2}^n} + 3}} = \lim \frac{{1 + {{\left( {\frac{1}{2}} \right)}^n}}}{{2 + 3.{{\left( {\frac{1}{2}} \right)}^n}}} = \frac{{1 + 0}}{{2 + 0}} = \frac{1}{2}\)