exam Maths Puzzle Numerical Ability

Hi! I need help solving

(x^-2+y^-2)/(xy+x^-2y^-2)

Thanks for the help in advance!

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exam Other Question

Simplify: (27^(-2x))(25^x)(3^(6x))^1/2 / 9^x(625^(x-1))^-2 how do i go about solving the following problem?
find the indicated values. h(1), h(3) and h(4)