exam Maths Puzzle Numerical Ability

Please simplify this:

1/a-b + 4/b-a - 8/a+b - 11a-5b/b^2-a^2

I have no idea where to begin. Please help--Thanks.

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exam Other Question

Trying to help my son logically solve following problem (rather than using guess and check):
(t^2) + m = 28
t + (m^2) = 148

Solve for t and m.

Thanks What is known about the # of solution to a system of m linear equations in n unkowns if "m=n", "m<n" and "m>n"?