Ta có :
\(\left|5\left(x-2\right)-4\right|=5\)
\(\Rightarrow\left[{}\begin{matrix}5\left(x-2\right)-4=5\\5\left(x-2\right)-4=-5\end{matrix}\right.\)
TH1:
\(5\left(x-2\right)-4=5\)
\(5\left(x-2\right)=5+4\)
\(5\left(x-2\right)=9\)
\(x-2=9:5\)
\(x-2=\dfrac{9}{5}\)
\(x=\dfrac{9}{5}+2\)
\(x=\dfrac{19}{5}\)
TH2:
\(5\left(x-2\right)-4=-5\)
\(5\left(x-2\right)=-5+4\)
\(5\left(x-2\right)=-1\)
\(x-2=-1:5\)
\(x-2=\dfrac{-1}{5}\)
\(x=\dfrac{-1}{5}+2\)
\(x=\dfrac{9}{5}\)
Vậy \(x\in\left\{\dfrac{9}{5};\dfrac{19}{5}\right\}\) là giá trị cần tìm
ko có hiểu!! Đề kêu tính giá trị tuyệt đối hay tính x vậy bn???