1.7 Lösning 1c
Från Mathonline
\[ {5\,^2 \cdot\, 5\,^{-3} \over 5\,^{-2}} \, = \, {5\,^{2 \, + \, (-3)} \over 5\,^{-2}} \, = \, {5\,^{2 \, - \, 3} \over 5\,^{-2}} \, = \, {5\,^{-1} \over 5\,^{-2}} \, = \, 5\,^{-1 \, - \, (-2)} \, = \, 5\,^{-1 \, + \, 2} \, = \, 5\,^1 \, = \, 5 \]
