$${\mathtt{677}}{\mathtt{\,-\,}}\left({\mathtt{656}}{\mathtt{\,-\,}}{\mathtt{322}}\right){\mathtt{\,\times\,}}\left({\mathtt{839}}{\mathtt{\,-\,}}{\mathtt{86}}\right) = -{\mathtt{250\,825}}$$
$${\mathtt{t}} = {\frac{{log}_{10}\left({\mathtt{5}}\right)}{{log}_{10}\left({\mathtt{10}}\right)}} \Rightarrow {\mathtt{t}} = {\mathtt{0.698\: \!970\: \!004\: \!336\: \!018\: \!9}}$$
$${\mathtt{t}} = {\frac{{log}_{10}\left({\mathtt{1.936\: \!1}}\right)}{{log}_{10}\left({\mathtt{1.045}}\right)}} \Rightarrow {\mathtt{t}} = {\mathtt{15.009\: \!595\: \!389\: \!527\: \!665\: \!8}}$$
http://www.spiegel.de/schulspiegel/wissen/problemfach-mathe-vielleicht-vielleicht-auch-nicht-a-772134.html
http://www.schlosser.info/angst-mathematik-schule-lehrer/
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{tan}}^{\!\!\mathtt{-1}}{\left({\mathtt{1.110\: \!612\: \!514\: \!829}}\right)} = {\mathtt{47.999\: \!999\: \!999\: \!995^{\circ}}}$$