\(19^{5^{2003}}=\left(...9\right)^{2003}=\left(...9\right)^{2000}.\left(...9\right)^3\)
\(=\left(...1\right).729=\left(...9\right)\)
Vậy.....
\(8^{2004}=8^{2000}.8^4=\left(...6\right).\left(...6\right)=\left(...6\right)\)
Vậy......
\(7^{2003}=7^{2000}.7^3=\left(...1\right).343=\left(...3\right)\)
Vậy......