$a)1,3.Ix-1I-2,6=0$
$1,3.Ix-1I=2,6$
$Ix-1I=2$
$=>x-1=2 hay x-1=-2$
$=>x=2+1hay x=-2+1$
$=>x=3 hay x=-1$
$b)2Ix-5I-2,5=250%$
$=>2Ix-5I=5$
$=>Ix-5I=5:2$
$=>Ix-5I=2,5$
$=>x-5=2,5 hay x-5=-2,5$
$=>x=2,5+5 hay x=-2,5+5$
$=>x=7,5 hay x=2,5$
$c)|x+2|=2x-1$
\(\left[ \begin{array}{l}x+2=2x-1\\x+2=1-2x\end{array} \right.\)
\(\left[ \begin{array}{l}x-2x=-2-1\\x+2x=1-2\end{array} \right.\)
\(\left[ \begin{array}{l}-1x=-3\\3x=-1\end{array} \right.\)
\(\left[ \begin{array}{l}x=3\\x=\frac{-1}{3}\end{array} \right.\)
$d)I2x-3I-x+1=0$
$I2x-3I-x=0-1$
$I2x-3I-x=-1$
$I2x-3I=x-1$
\(\left[ \begin{array}{l}2x-3=x-1\\2x-3=1-x\end{array} \right.\)
\(\left[ \begin{array}{l}2x-x=3-1\\2x+x=1+3\end{array} \right.\)
\(\left[ \begin{array}{l}x=2\\3x=4\end{array} \right.\)
\(\left[ \begin{array}{l}x=3\\x=\frac{4}{3}\end{array} \right.\)
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