1 câu trả lời
\(|x-1|+ 3x= 1\)
TH1: \(x-1>0\Leftrightarrow x>1\)
pt \(\Rightarrow x-1+3x=1\)
\(\Rightarrow 4x=2\)
\(\Rightarrow x=\dfrac{1}{2}\) (loại).
Th2: \(x-1\le0\Leftrightarrow x\le1\)
pt \(\Rightarrow -(x-1)+3x=1\)
\(\Rightarrow -x+1+3x=1\)
\(\Rightarrow 2x=0\)
\(\Rightarrow x=0\) (tm).
