a)
Ta có :
\(1024^9=\left(2^{10}\right)^9=2^{90}< 2^{100}\)
\(\Rightarrow1024^9< 2^{100}\)
b)
\(\begin{cases}9^{12}=\left(3^2\right)^{12}=3^{24}\\27^7=\left(3^3\right)^7=3^{21}\end{cases}\)
Vì \(3^{24}>3^{21}\)
=> \(9^{12}>27^7\)
c)
\(\begin{cases}125^{80}=\left(5^3\right)^{80}=5^{240}\\25^{118}=\left(5^2\right)^{118}=5^{236}\end{cases}\)
=> 12550>25118