Question

|x-\(\dfrac{2}{7}\)|=\(\dfrac{3}{14}\)

làm theo cách lớp 7 giúp mk nha

Answer 1

\(\left|x-\dfrac{2}{7}\right|=\dfrac{3}{14}\)

\(\Rightarrow\left[{}\begin{matrix}x-\dfrac{2}{7}=\dfrac{3}{14}\\x-\dfrac{2}{7}=\dfrac{-3}{14}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=\dfrac{1}{14}\end{matrix}\right.\)

Vậy ...................

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Answer 2

Giải:

\(\left|x-\dfrac{2}{7}\right|=\dfrac{3}{14}\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{2}{7}=\dfrac{3}{14}\\x-\dfrac{2}{7}=-\dfrac{3}{14}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{14}+\dfrac{2}{7}\\x=-\dfrac{3}{14}+\dfrac{2}{7}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=\dfrac{1}{14}\end{matrix}\right.\)

Vậy \(x=\dfrac{1}{2}\) hoặc \(x=\dfrac{1}{14}\).

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