Distributivgesetz
\(\begin{aligned} & w\cdot\frac{Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}+4w\cdot\frac{Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \frac{w\cdot Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}+\frac{4w\cdot Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \left(\frac{w\cdot Q}{10}+\frac{4w\cdot Q}{10}\right)\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \frac{w\cdot Q+4w\cdot Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \frac{\left(1+4\right)w\cdot Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \frac{5w\cdot Q}{10}\cdot\left(\frac{r}{4w}\right)^{0,8}\\ =\, & \frac{\cancel{5}w\cdot Q}{\cancel{10}_{2}}\cdot\left(\frac{r}{4w}\right)^{0,8} \end{aligned}\)