Question 92147
[ x y^5 / x^-4 y^2 ]^-2 
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Break the expression into pieces:
[(x/x^-4)*(y^5/y^2)]^(-2)

Simplify each piece:
[(x^5)(y^3)]^(-2)
{{{x^-10*y^-6}}}
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Now, to get rid of the negative exponent, you simply "flip" the expression:
{{{1/(x^10*y^6)}}}