Question

Mình chỉ hỏi bài này nữa thôi.Ai trả lời được mình cho 5 tick

Answer 1

\(\dfrac{2}{5}< \left|x-\dfrac{7}{5}\right|< \dfrac{3}{5}\Rightarrow0,4< \left|x-\dfrac{7}{5}\right|< 0,6\)

\(\Rightarrow\left|x-\dfrac{7}{5}\right|=\dfrac{1}{2}\Rightarrow x-\dfrac{7}{5}=\left[{}\begin{matrix}\dfrac{1}{2}\\-\dfrac{1}{2}\end{matrix}\right.\)

\(\Rightarrow x=\left[{}\begin{matrix}\dfrac{1}{2}+\dfrac{7}{5}\\-\dfrac{1}{2}+\dfrac{7}{5}\end{matrix}\right.\Rightarrow x=\left[{}\begin{matrix}\dfrac{19}{10}\\\dfrac{9}{10}\end{matrix}\right.\)

Vậy \(x=\dfrac{19}{10}\) hoặc \(x=\dfrac{9}{10}\)