Помогииииииииииите)))

Решите задачу:

$\lim_{n \to +\infty} \cfrac{2n+1}{n-1} =\lim_{n \to +\infty} \cfrac{ \frac{2n}{n} +\frac{1}{n}}{ \frac{n}{n} -\frac{1}{n}}= \lim_{n \to +\infty} \cfrac{2+\frac{1}{n}}{1-\frac{1}{n}}= \cfrac{2}{1} =2 \\\\ \lim_{n \to +\infty} \cfrac{n^2}{2n^2-1}= \lim_{n \to +\infty} \cfrac{ \frac{n^2}{n^2} }{ \frac{2n^2}{n^2} -\frac{1}{n^2}}= \lim_{n \to +\infty} \cfrac{ 1 }{2 -\frac{1}{n^2}}=\cfrac{1}{2}=0.5$