Question

Tìm x, biết : \(\frac{1}{4}\left|x\right|-2,5=-\frac{1}{2}\)

Answer 1

Đoạn đó ( dưới ) :

\(\Rightarrow\left[\begin{array}{nghiempt}\frac{1}{4}x=2\\\frac{1}{4}x=-2\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=8\\x=-8\end{array}\right.\)

Answer 2

:)

Giải :

\(\frac{1}{4}\left|x\right|-2,5=-\frac{1}{2}\)

\(\Rightarrow\frac{1}{4}\left|x\right|=2\)

\(\Rightarrow\left[\begin{array}{nghiempt}\frac{1}{4}.x=2\\\frac{1}{4}.x=-2\end{cases}\Rightarrow\left[\begin{array}{nghiempt}x=8\\x=-8\end{array}\right.}\)

Answer 3

\(\frac{1}{4}\) \(\left|x\right|\)  - \(2,5\)  = \(-\frac{1}{2}\) 

\(\frac{1}{4}\) \(\left|x\right|\)             = \(-\frac{1}{2}\)  + \(2,5\)  = 2

 \(\left|x\right|\)                = \(2\) : \(\frac{1}{4}\) 

\(\Rightarrow\) 

\(x\) = 8\(x=-8\)

Answer 4

\(\frac{1}{4}\left|x\right|-2,5=-\frac{1}{2}\)

\(\Rightarrow\frac{1}{4}\left|x\right|=-\frac{1}{2}+2,5=2\)

\(\Rightarrow\left|x\right|=-3:\frac{1}{4}=8\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=8\\x=-8\end{array}\right.\)

Vậy : \(\left[\begin{array}{nghiempt}x=8\\x=-8\end{array}\right.\)