Question

Tìm STN x, biết :

x¹⁵ = x

Answer 1

Vì \(x^{15}=x\)

=> \(\orbr{\begin{cases}x=0\\x=1\end{cases}}\)

Answer 2

Thank you

Answer 3

\(x^{15}=x\)

=> \(x^{15}-x=0\)

=> \(x\left(x^{14}-1\right)=0\)

=> \(\hept{\begin{cases}x=0\\x^{14}-1=0\end{cases}}\)

=> \(\hept{\begin{cases}x=0\\x^{14}=1\end{cases}}\)

=> \(\hept{\begin{cases}x=0\\x=1\end{cases}}\)