\(\left|x-1\right|=12\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=12\\x-1=-12\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=13\\x=-11\end{matrix}\right.\)
\(\left[{}\begin{matrix}x-1=12\\x-1=-12\end{matrix}\right.\left[{}\begin{matrix}x=13\\x=-11\end{matrix}\right.\)
x - 1 = 12 hoặc x - 1 = -12
x = 13 hoặc x = -11
\(|x-1|=12\)
\(\Rightarrow x-1=\pm12\)
\(x-1=12\)
\(x=12+1\)
\(x=13\)
\(x-1=-12\)
\(x=-12+1\)
\(x=-11\)
\(\Rightarrow x=\left\{13;-11\right\}\)
