Tìm `x` `in` `N` biết: `a)` `x^10` `=` `1^x` `b)` `x^10` `=` `x`

` a) x^(10) = 1^(x)`

`=> x^(10) = 1`

`=>` \(\left[ \begin{array}{l}x=1\\x=-1\end{array} \right.\) 

Vì `x \in NN `nên `x = 1`

` b) x^(10) = x`

`=> x^(10) - x = 0`

`=> x(x^9 - 1) = 0`

`=>` \(\left[ \begin{array}{l}x=0\\x^9 - 1 = 0\end{array} \right.\) 

` =>` \(\left[ \begin{array}{l}x=0\\x^9 = 1\end{array} \right.\) 

`=>` \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\)