Answer 1

giải giúp mik

 

Answer 2

\(\left|x\right|=\dfrac{7}{4}\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{7}{4}\\x=-\dfrac{7}{4}\end{matrix}\right.\)

Answer 3

\(\left[{}\begin{matrix}x=\dfrac{7}{4}\\x=-\dfrac{7}{4}\end{matrix}\right.\)

Answer 4

\(\left|x\right|=\dfrac{7}{4}\)

nên \(x\in\left\{\dfrac{7}{4};-\dfrac{7}{4}\right\}\)