Question 93097
{{{(4/xy^2)^ -3)}}}
{{{(4^-3/x^-3y^(2*-3))}}} [distribute the (-3) power to all of the terms within the parathesis]
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{{{(x^3y^6/4^3)}}} [flip terms with negative exponents.  this will cause the exponents to become positive]
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{{{(x^3y^6/64)}}}  [simplify]