({x^-1 y^4 z^-4}{y^-2 z^3 x^-5})^-1 =z^r/(x^s y^t)
r the exponent of z is
s the exponent of x is
t the exponent of y is
Just remember that
xaxb = xa+b
and these rules apply to the power expressions as well.
also
(a/b)-c = (b/a)c might help.
({x^-1 y^4 z^-4}{y^-2 z^3 x^-5})^-1 =z^r/(x^s y^t)
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