Simplificati fractiile
a) x^2-x-6/x^2-3x-10
b)x^2-6x-7/x^2-9x+14
c)4x^2-5x+1/x^2+5x+6
d)3x^2+7x +2/2-3x^2-5x
e)x^3 +x^2-12x/x^2-2x-3
f)2x^2+11x-6/x^3+3x^2-18x
g)x^3+5x^2-14x/x2-2x-8
h)3x^2-16x+5/2-3x^2-5x