Cho dãy số \({u_n}\) thỏa \(\mathop {\lim }\limits_{} {u_n} = 2.\) Tính \(\mathop {\lim }\limits_{} \left( {{u_n} + \frac{{{2^n}}}{{{2^n} + 3}}} \right).\)

* Hướng dẫn giải

\(\begin{array}{l}\lim \left( {{u_n} + \frac{{{2^n}}}{{{2^n} + 3}}} \right)\\ = \lim {u_n} + \lim \frac{{{2^n}}}{{{2^n} + 3}}\\ = \lim {u_n} + \lim \frac{1}{{1 + \frac{3}{{{2^n}}}}}\\ = 2 + 1 = 3\end{array}\).