1) (b+5)³-b*(b-5)²-25*(1+b)²=
=b³+15b²+75b+125-b³+10b²-25b-25-50b-25b²≡100.
2) 5*(1-b)³+5b*(1+b)²-(1-5b)²=
=5-15b+15b-5b³+5b+10b²+5b³-1+10b-25b²≡4.
3) (2b-3)³-4b²*(2b-6)+6b*(2b-9)=
=8b³-36b²+54b-27-8b³+24b²+12b²-54b≡-27.
4) (b+2)³+(2b+1)³-9b*(b²+2b+2)-10=
=b³+6b²+12b+8+8b³+12b²+6b+1-9b³-18b²-18b-10≡-1.