TeX Quellcode:
\left(-\dfrac{1}{2} + \dfrac{1}{2}i \right) \cdot \left(\dfrac{7}{20} - \dfrac{1}{10}i \right) \; = \; -\dfrac{7}{40}+\dfrac{1}{20}i+\dfrac{7}{40}i-\dfrac{1}{20}i^2 \; = \; -\dfrac{1}{8}+\dfrac{9}{40}i