\(\lim\limits\frac{3^n+4^n+3}{4^n+2^n-1}=\lim\limits\frac{\left(\frac{3}{4}\right)^n+1+3\left(\frac{1}{4}\right)^n}{1+\left(\frac{2}{4}\right)^n-\left(\frac{1}{4}\right)^n}=\frac{0+1+0}{1+0+0}=1\)
\(\lim\limits\frac{5.2^n+9.3^n}{2.2^n+3.3^n}=\lim\limits\frac{5\left(\frac{2}{3}\right)^n+9}{2.\left(\frac{2}{3}\right)^n+3}=\frac{0+9}{0+3}=3\)
\(\lim\limits\frac{4^n-7^n}{2^n+15^n}=\lim\limits\frac{\left(\frac{4}{15}\right)^n-\left(\frac{7}{15}\right)^n}{\left(\frac{2}{15}\right)^n+1}=\frac{0-0}{0+1}=0\)
\(\lim\limits\frac{6.5^n+9^n}{3.12^n+7^n}=\lim\limits\frac{6\left(\frac{5}{12}\right)^n+\left(\frac{9}{12}\right)^n}{3+\left(\frac{7}{12}\right)^n}=\frac{0+0}{3+0}=0\)
\(\lim\limits\frac{\sqrt{5}^n}{3^n+1}=\lim\limits\frac{\left(\frac{\sqrt{5}}{3}\right)^n}{1+\left(\frac{1}{3}\right)^n}=\frac{0}{1+0}=0\)
\(\lim\limits\frac{5.5^n-3.7^n}{3.10^n+36.6^n}=\lim\limits\frac{5.\left(\frac{5}{10}\right)^n-3\left(\frac{7}{10}\right)^n}{3+36\left(\frac{6}{10}\right)^n}=\frac{0-0}{3+0}=0\)