1.7 Lösning 7c
Från Mathonline
\[ \displaystyle{ {a^{-5} \cdot a^9 \over (a^{-9})^{1/3}} \, = \, {a^{-5+9} \over a^{-9 \cdot {1 \over 3}}} \, = \, {a^4 \over a^{-9 \over 3}} \, = \, {a^4 \over a^{-3}} = {a^{4-(-3)}} = a^{4+3} \, = \, a\,^7 } \]
