a) Vì 453>450\(\Rightarrow3^{453}>3^{450}\left(1\right)\)
mà \(3^{450}=3^{3.150}=\left(3^3\right)^{150}=27^{150}\left(2\right)\)
\(Từ\left(1\right),\left(2\right)\Rightarrow3^{453}>27^{150}\left(3\right)\)
Ta có: \(5^{300}=5^{2.150}=\left(5^2\right)^{150}=25^{150}\)
Vì \(27>25\Rightarrow27^{150}>25^{150}\left(4\right)\)
\(Từ\left(3\right),\left(4\right)\Rightarrow3^{453}>27^{150}>25^{150}\)
\(\Rightarrow3^{453}>25^{150}\)
hay:\(3^{453}>5^{300}\)