exam Maths Puzzle Numerical Ability

How do you do porportions?

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exam Other Question

Resolve 7-8x/(1-x)*(2-x)into partial fractions.Hence find the expansion of the function in ascending powers of x as far as three nonzero terms. State for which values of x this expansion is valid

I need this answer,today.Please. I think i need to multiply the exponents but im not entirely sure.
(3x^2y^3/4x^-2)^3