\(|2x-5|=13\)
TH1: \(2x-5=13\)
\(2x=18\)
\(x=9\)
TH2: \(2x-5=-13\)
\(2x=-8\)
\(x=-4\)
Vậy: \(x\in\left\{-4;9\right\}\)
=.= hk tốt!!
\(\left|2x-5\right|=13\)
\(\Leftrightarrow\orbr{\begin{cases}2x-5=13\\2x-5=-13\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-4\end{cases}}\)
\(\left|5x-2\right|\le13\)
\(\Rightarrow x\in\left\{-1;0;1;2;3\right\}\)