exam Maths Puzzle Numerical Ability

I am really struggling with how to do this. Can someone please help? Thanks.
[xy^5 / x^-4 y^2]^-2

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exam Other Question
I understand what to do when the signs are the same in this problem but what do I do if they differ? 89.3+(-14.4) 24/4-x^2=6/x+2-3x/x-2