$\left\{\begin{matrix}\\k=\frac{1}{8}=0.125\text{, }&\text{unconditionally}\\k\in \mathrm{R}\text{, }&m=0\end{matrix}\right.$

$\left\{\begin{matrix}\\m=0\text{, }&\text{unconditionally}\\m\in \mathrm{R}\text{, }&k=\frac{1}{8}\end{matrix}\right.$