a/ \(m-2x\ge0\Rightarrow x\le\frac{m}{2}\Rightarrow\frac{m}{2}=2\Rightarrow m=4\)
b/ \(4m^2-x\ge0\Rightarrow x\le4m^2\Rightarrow4m^2=2\Rightarrow m=\pm\frac{\sqrt{2}}{2}\)
c/ \(\left\{{}\begin{matrix}m-x\ge0\\m+1-x\ge0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x\le m\\x\le m+1\end{matrix}\right.\) \(\Rightarrow m=2\)