Question

\(\dfrac{7}{5}\) - \(\dfrac{1}{5}\) / x + 3 / = 1

 

Answer 1

\(\dfrac{7}{5}-\dfrac{1}{5}.\left|x+3\right|=1\)
\(\Rightarrow\dfrac{1}{5}.\left|x+3\right|=\dfrac{7}{5}-1\)
\(\Rightarrow\dfrac{1}{5}.\left|x+3\right|=\dfrac{7}{5}-\dfrac{5}{5}\)
\(\Rightarrow\dfrac{1}{5}.\left|x+3\right|=\dfrac{2}{5}\)
\(\Rightarrow\left|x+3\right|=\dfrac{2}{5}:\dfrac{1}{5}\)
\(\Rightarrow\left|x+3\right|=\dfrac{2}{5}.5\)
\(\Rightarrow\left|x+3\right|=\dfrac{2.1}{1}\)
\(\Rightarrow\left|x+3\right|=2\)
\(\Rightarrow x+3=2\) hoặc \(x+3=-2\)
\(\Rightarrow x=2-3\) hoặc \(x=\left(-2\right)-3\)
\(\Rightarrow x=-1\) hoặc \(x=-5\)
Vậy \(x\in\left\{-1;-5\right\}\)

Answer 2

là sao bạn

Answer 3

\(\dfrac{7}{5}-\dfrac{1}{5}\left|x+3\right|=1\)

\(\Rightarrow\dfrac{1}{5}\left|x+3\right|=\dfrac{2}{5}\)

\(\Rightarrow\left|x+3\right|=2\)

\(\Rightarrow\left[{}\begin{matrix}x+3=2\\x+3=-2\end{matrix}\right.\)

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

Vậy..