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-34x^2/51xy^5 = -2x/3y^3
b)
5(x-3)/(3-x)y = -5(3-x)/(3-x)y = -5/y
c)
(x^2 - 2x)/(x^2 - 4y) tego nie da się skrócić
d)
(x^2 - 9)/(3x + 9) = (x + 3)(x - 3)/3(x + 3) = (x -3)/3
e)
(2x^3 + 16)/(x^2 - 2x + 4) = (2x^3 + 2*2^3)/(x^2 - 2x + 4) = 2(x^3 + 2^3)/(x^2 - 2x + 4) =
= 2(x+2)(x^2 - 2x + 4)/(x^2 - 2x +4) = 2(x + 2) = 2x + 4