\(2-\left|\frac{3}{4}-x\right|=\frac{7}{12}\)
\(\left|\frac{3}{4}-x\right|=2-\frac{7}{12}\)
\(\left|\frac{3}{4}-x\right|=\frac{24}{12}-\frac{7}{12}\)
\(\left|\frac{3}{4}-x\right|=\frac{17}{12}\)
\(\frac{3}{4}-x=\pm\frac{17}{12}\)
TH1:
\(\frac{3}{4}-x=\frac{17}{12}\)
\(x=\frac{3}{4}-\frac{17}{12}\)
\(x=\frac{9}{12}-\frac{17}{12}\)
\(x=-\frac{8}{12}\)
\(x=-\frac{2}{3}\)
TH2:
\(\frac{3}{4}-x=-\frac{17}{12}\)
\(x=\frac{3}{4}-\left(-\frac{17}{12}\right)\)
\(x=\frac{9}{12}+\frac{17}{12}\)
\(x=\frac{26}{12}\)
\(x=\frac{13}{6}\)
Vậy \(x=-\frac{2}{3}\) hoặc \(x=\frac{13}{6}\)
Chúc bạn học tốt
\(2-\left|\frac{3}{4}-x\right|=\frac{7}{12}=\left|\frac{3}{4}-x\right|=2-\frac{7}{12}\Rightarrow\left|\frac{3}{4}-x\right|=\frac{17}{12}\Rightarrow\begin{cases}\frac{3}{4}-x=\frac{17}{12}\\\frac{3}{4}-x=-\frac{17}{12}\end{cases}\Rightarrow\begin{cases}x=\frac{-2}{3}\\\frac{13}{6}\end{cases}}\)
2-|3/4-x|=7/12
|3/4-x|=2-7/12
|3/4-x|=24/12-7/12
|3/4-x|=17/12
=>3/4-x=17/12 hoặc 3/4-x=-17/12
x=3/4-17/12 x=3/4-(-17/12)
x=9/12-17/12 x=9/12-(-17/12)
x=2/3 x=7/4
vậy x thuộc{2/3 ; 7/4}