\(x^{50}=x\)
\(\Leftrightarrow x^{50}-x=0\)
\(\Leftrightarrow x\left(x^{49}-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}-1=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\in N\\x=1\in N\end{cases}}\)
Vậy \(x\in\left\{0;1\right\}\)
x\(^{50}\)=x
x\(^{50}\)-x=0
x.x\(^{49}\)-x.1=0
x.(x\(^{49}\)-1)=0
\(\Rightarrow\)x=0 hoặc x\(^{49}\)-1=0
x\(^{49}\) =1
x\(^{49}\)= 1\(^{49}\)=(-1)\(^{49}\)
\(\Rightarrow\)x=1 hoặc x=-1