Ta có: \(43^{43}=\left(43^4\right)^{10}.43^3=\left(...01\right)^{10}.43^3=\left(...1\right).79507=\left(...7\right)\\ \)
\(17^{17}=\left(17^4\right)^4.17=\left(...01\right)^4.17=\left(...1\right).17=\left(...7\right)\)
\(\Rightarrow43^{43}-17^{17}=\left(...7\right)-\left(...7\right)=\left(...0\right)⋮10\)