TeX source:

\frac{p}{q}=\pm \frac{1}{1}, \quad \pm \frac{1}{2} \quad \frac{p}{q}=\pm \frac{2}{1}, \pm \quad \frac{2}{2} \quad \frac{p}{q}=\quad \pm \quad \frac{4}{1}, \pm \quad \frac{4}{2}