\(a,\Rightarrow\left[{}\begin{matrix}2,5-x=1,3\left(x\le2,5\right)\\x-2,5=1,3\left(x>2,5\right)\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1,2\left(tm\right)\\x=3,8\left(tm\right)\end{matrix}\right.\\ b,\Rightarrow\left|x-0,2\right|=1,6\Rightarrow\left[{}\begin{matrix}x-0,2=1,6\left(x\ge0,2\right)\\0,2-x=1,6\left(x< 0,2\right)\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1,8\left(tm\right)\\x=-1,4\left(tm\right)\end{matrix}\right.\\ c,\Rightarrow\dfrac{1}{7}:x=\dfrac{3}{14}\Rightarrow x=\dfrac{3}{14}\cdot7=\dfrac{3}{2}\\ d,\Rightarrow x-\dfrac{1}{2}=0\Rightarrow x=\dfrac{1}{2}\\ e,\Rightarrow\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\\ f,\Rightarrow2x-1=-2\Rightarrow2x=-1\Rightarrow x=-\dfrac{1}{2}\)
