\(\left(5^2\right)^4.\left(5^3\right)^4\)
\(=5^8.5^{12}\)
\(=5^{20}\)
Cách 2
\(\left(5^2\right)^4.\left(5^3\right)^4\)
\(=\left(5^2.5^3\right)^4\)
\(=\left(5^5\right)^4\)
\(=5^{20}\)
\(=5^{2\times4}\times5^{3\times4}=5^8\times5^{12}=5^{8+12}=5^{20}\)