\(A=|2x+1|+|x-1|-|x-2|\)
Khi \(x< \frac{-1}{2}\) thì \(|2x+1|=-1-2x;|x-1|=1-x;|x-2|=2-x\)
\(\Rightarrow A=-2x-1+1-x+x-2\)
\(A=-2x-2\)
Khi \(\frac{-1}{2}\le x\le1\) thì \(|2x+1|=2x+1;|x-1|=1-x;|x-2|=2-x\)
\(\Rightarrow A=2x+1+1-x+x-2\)
\(A=2x\)
Khi \(1< x< 2\) thì \(|2x+1|=2x+1;|x-1|=x-1;|x-2|=2-x\)
\(\Rightarrow A=2x+1+x-1+x-2\)
\(A=4x-2\)
Khi \(x\ge2\) thì \(|2x+1|=2x+1;|x-1|=x-1;|x-2|=x-2\)
\(\Rightarrow A=2x+1+x-1+2-x\)
\(A=2x+2\)