book Maths Puzzle Numerical Ability

How do you perform this operation to its simplest form:
1/x2y.2/xy.3/xy2
The first and the last "2" are exponents
Thanks

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book Other Question

(2a+y)(4a+b)

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Can you help solve this and explain how?

Find the midpoint between these points:
(2, 3) and (8, 1)

Thank you.
Penalope