a.\(\left|x-2\right|=x\)
\(\orbr{\begin{cases}x-2=x\\x-2=-x\end{cases}\Rightarrow\orbr{\begin{cases}-2=x-x\\-2=-x-x\end{cases}}}\Rightarrow\orbr{\begin{cases}-2=0\left(KTM\right)\\-2=-2x\end{cases}}\Rightarrow x=1\)
b. \(\left|x-3,4\right|+\left|2,6-x\right|=0\)
\(\hept{\begin{cases}\left|x-3,4\right|=0\\\\\left|2,6-x\right|=0\end{cases}}\Rightarrow\hept{\begin{cases}x-3,4=0\\\\2,6-x=0\end{cases}}\Rightarrow\hept{\begin{cases}x=3,4\\\\x=2,6\end{cases}}\)
Cố gắng học tốt nhé bạn !!!