/ 1.3 - 1/4x / = 2.6

Đáp án:

\(\left[ \begin{array}{l}x=-36\\x=60\end{array} \right.\) 

Giải thích các bước giải:

|1.3-$\dfrac{1}{4}$ x|=2.6

|1.3-$\dfrac{1}{4}$ x|=12

|3-$\dfrac{1}{4}$ x|=12

$->$ \(\left[ \begin{array}{l}3-\dfrac{1}{4}x=12\\3-\dfrac{1}{4}x=-12\end{array} \right.\) 

$->$ \(\left[ \begin{array}{l}\dfrac{1}{4}x=3-12\\\dfrac{1}{4}x=3-(-12)\end{array} \right.\) 

$->$ \(\left[ \begin{array}{l}\dfrac{1}{4}x=(-9)\\\dfrac{1}{4}x=15\end{array} \right.\) 

$->$ \(\left[ \begin{array}{l}x=(-9):\dfrac{1}{4}\\x=15:\dfrac{1}{4}\end{array} \right.\) 

$->$ \(\left[ \begin{array}{l}x=-36\\x=60\end{array} \right.\)