(8⅗*5⅔)¹⁵/10⁹
[m] \frac{(8^{3/5}*5^{2/3})^{15}}{10^9} = \frac{8^{3*15/5}*5{2*15/3}}{10^9} = \frac{8^9*5^{10}}{10^9} = \frac{2^{3*9}*5^{10}}{2^9*5^9} = \frac{2^{27}*5}{2^9} = 2^{18}*5[/m]
