(x^5+x^4+2x^3-3x^2+x-3)/(x-1)

a) (x^5+x^4+2x^3-3x^2+x-3)/(x-1)
b) (5x^3-3x^2+7)/(x^2+1)
c) (6x^3-2x^2-9x+3)/(3x-1)
d) x^3+x^2-12x)/(x-2)