Hallo Anonymous,
hier die Übersetzung in die mathematische Sprache:
$${\frac{{\mathtt{1}}}{{\mathtt{a}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{b}}}} = {\mathtt{2}}{\mathtt{\,\times\,}}\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right)$$
kann man noch umformen => 2ab = 1
$${\frac{{\mathtt{b}}}{{\mathtt{ab}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{a}}}{{\mathtt{ab}}}} = {\mathtt{2}}{\mathtt{\,\times\,}}\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right)$$ => $${\frac{\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right)}{{\mathtt{ab}}}} = {\mathtt{2}}{\mathtt{\,\times\,}}\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right)$$ => $${\frac{\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right)}{\left(\left({\mathtt{a}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right){\mathtt{\,\times\,}}{\mathtt{ab}}\right)}} = {\mathtt{2}}$$
$${\frac{{\mathtt{1}}}{{\mathtt{ab}}}} = {\mathtt{2}}$$ => 2ab = 1 => a*b = 0,5 => a = 0,5 / b
Gruß radix !