exam Maths Puzzle Numerical Ability

I need some help
Express answer in simplist form:
8/s+8/s^2

and also
Simplify

x+2/x/ x-2/3x

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exam Other Question

i am taking a nursing entrance exam test in a couple of weeks and i need some practice for the math part of it since i have been out of school for 6 years now. so i need to know a Can you help me simplify the following leaving the answer in index form please.

4m^8x2m^2/6m^5 or 4mx10 to the eight x 2m squared divided by 6m to the power of 5