Ta có: \(25^8+5^{17}\)
\(=5^{16}+5^{17}=5^{16}\left(1+5\right)=5^{16}\cdot6=5^{15}\cdot30⋮30\)(đpcm)
Bài giải
\(25^8+5^{17}=\left(5^2\right)^8+5^{17}=5^{16}+5^{17}=5^{16}\left(1+5\right)=6\cdot5\cdot5^{15}=30\cdot5^{15}\text{ }⋮\text{ }30\)
\(\Rightarrow\text{ ĐPCM}\)