Х²(х-1)(х²+х+1)-(х-1)(х+1)=(х-1)(х^4+x³+x²-[-1) х³(х+1)-(х+1)=(х+1)х-1)(х²+х+1) m^4(m-1)(m+1)+2m²(m+1)=m²(m+1)(m³-m²+2) (b-2)(b²+2b+4)+6b(b-2)=(b-2)(b²+8b+4)