Tìm x, biết: |x| =1/5 +3/4

* Hướng dẫn giải

$a\left)\left[\begin{array}{l}x=\frac{19}{20}\\ x=\frac{19}{20}\end{array}\right.\begin{array}{cccc}& & & \end{array}b\right)\left[\begin{array}{l}x=\frac{83}{12}\\ x=\frac{-37}{12}\end{array}\right.$

$c\left)\left[\begin{array}{l}x=\frac{31}{12}\\ x=\frac{-25}{12}\end{array}\right.\begin{array}{cccc}& & & \end{array}d\right)\left[\begin{array}{l}x=\frac{13}{4}\\ x=\frac{-7}{12}\end{array}\right.$