`M=x^6-20.x^5+20.x^4-20.x^3+20.x^2-20.x+20`
Thay `x=19` được `M=19^6-20.19^5+20.19^4-20.19^3+20.19^2-20.19+20`
`M=19^6-[20.(19^5+19^4-19^3+19^2-)-(20.19+20)]`
`M=19^6-[20.(2476099+130321-6859+361)-(20.20)]`
`M=47045881-(20.2599922-400]`
`M=47045881-(51998440-400)`
`M=47045881-51998040`
`M=(-4952159)`