Đáp án:
\(\left[{}\begin{matrix}x=0\\x=5\\x=4\end{matrix}\right.\)
Giải thích các bước giải:
`|x(x - 4)| = x`
`=>` \(\left[{}\begin{matrix}x\left(x-4\right)=x\\x\left(x-4\right)=-x\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x^2-5x=0\\x^2-4x=0\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x\left(x-5\right)=0\\x\left(x-4\right)=0\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x=0\\x-5=0\\x-4=0\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x=0\\x=5\\x=4\end{matrix}\right.\)
