Simplificati Fractiile:
a) (x²+x+1)(x²+x+4)+2 supra (x²+x+1)(x²+x+5)+3
b) (x²-3x+1)(x²-3x+4)+2 supra (x²-3x+1)(x²-3x+6)+6
c) (x²+2x)(x²+2x+4)+3 supra (x²+2x)(x²+2x+5)+6
d) (2x²+x)(2x²+x-3)+2 supra (2x² +x)(2x²+x-4)+3