1. Tìm (2 – n) / (n + 1) 2. Tìm (n – 2) / (3n + 1)

1)

$\,\,\,\,\lim \dfrac{2-n}{n+1}$

$=\lim \dfrac{-n+2}{n+1}$

$=\lim \dfrac{-1+\dfrac{2}{n}}{1+\dfrac{1}{n}}$

$=\dfrac{-1}{1}$

$=-1$

2)

$\,\,\,\,\lim \dfrac{n-2}{3n+1}$

$=\lim \dfrac{1-\dfrac{2}{n}}{3+\dfrac{1}{n}}$

$=\dfrac{1}{3}$