a/ \(2^{100}=\left(2^3\right)^{100}=8^{100}>8^{30}\)
b/ \(3^{75}=\left(3^3\right)^{25}=27^{25}\)
\(4^{50}=\left(4^2\right)^{25}=16^{25}\)
\(\Rightarrow3^{75}>4^{50}\)
c/ \(9^{199}=\left(3^2\right)^{199}=3^{398}\)
\(27^{121}=\left(3^3\right)^{121}=3^{363}\)
\(\Rightarrow9^{199}>27^{121}\)
d/ \(26^{38}>16^{38}=\left(2^4\right)^{38}=2^{152}\)
\(64^{25}=\left(2^6\right)^{25}=2^{150}\)
\(\Rightarrow26^{38}>64^{25}\)