Question

1, Tìm x biết:

3x - *2x+1*=2

chú ý:* là dấu giá trị tuyệt đối

Answer 1

\(x\ge-\frac{1}{2}\Rightarrow3x-2x-1=0\Rightarrow x=1\)

\(x< \frac{-1}{2}\Rightarrow3x+2x+1\Rightarrow x=-\frac{1}{5}\left(loai\right)\)

Answer 2

\(3x-|2x-1|=2\Leftrightarrow|2x-1|=2-3x\)

\(\Rightarrow-2x+1=2-3x\)hoặc \(-2x+1=3x-2\)

\(\Rightarrow1x+1=2\)hoặc \(-5x+1=-2\)

\(\Rightarrow x=1\)hoặc\(x=\frac{5}{3}\)