Bài làm :
\(1\text{)}\hept{\begin{cases}5^{30}=\left(5^3\right)^{10}=125^{10}\\3^{50}=\left(3^5\right)^{10}=243^{10}\end{cases}}\Rightarrow5^{30}< 3^{50}\)
\(2\text{)}\hept{\begin{cases}27^3=\left(3^3\right)^3=3^9\\9^5=\left(3^2\right)^5=3^{10}\end{cases}}\Rightarrow27^3< 9^5\)
\(3\text{)}14^{40}>14^{20}\)
\(4\text{)}\hept{\begin{cases}2< 12\\15< 16\end{cases}}\Rightarrow2^{15}< 12^{16}\)