Ta có:
\(64^9=4^m\)
\(\Rightarrow4^m=64^9\)
\(\Rightarrow4^m=\left(4^3\right)^9\)
\(\Rightarrow4^m=4^{3\cdot9}\)
\(\Rightarrow4^m=4^{27}\)
\(\Rightarrow m=27\)
Vậy: m = 27
\(4^m=64^9\)
=>\(4^m=\left(4^3\right)^9=4^{27}\)
=>m=27
4m=6494�=649
=>4m=(43)9=4274�=(43)9=427
=>m=27