Question 31347
{{{ ((x^3y-4z^0)/(5x^6y^8))^3 }}}
assuming this is what the problem is ... multiply out the numerator and denominator by themselves 3 times ...
{{{ ((x^3y-4z^0)/(5x^6y^8)) * ((x^3y-4z^0)/(5x^6y^8)) * ((x^3y-4z^0)/(5x^6y^8)) }}}
Anything to the zero = 1 so change that first.
{{{ ((x^3y-4)/(5x^6y^8)) * ((x^3y-4)/(5x^6y^8)) * ((x^3y-4)/(5x^6y^8)) }}}
Now foil out the numerators on the first 2 fractions.
{{{ ((x^6y^2 - 8x^3y + 16)/(25x^12y^16)) * ((x^3y-4)/(5x^6y^8)) }}}
now the next fraction ...
{{{ (x^9y^3-12x^6y^2+48x^3y-64)/(125x^18y^24) }}}
That is simplified.  There is nothing to evaluate if there is no given values for the variables.