a) \(32^{50}\)và \(27^{51}\)
\(32^{50}=\left(32^2\right)^{25}=1024^{25}\)
\(27^{51}=\left(27^2\right)^{25}.27=729^{25}.27\)
Vì \(1024>729\)nên \(1024^{25}>729^{25}.27\)hay \(32^{50}>27^{51}\)
b) \(31^9\)và \(9^{16}\)
\(31^9=\left(91^3\right)^2=273^2\)
\(9^{16}=\left(9^2\right)^4=81^4=\left(81^2\right)^2=6561^2\)
Vì \(6561>273\)nên \(273^2< 6561^2\)hay \(31^9< 9^{16}\).