`h)x^3-3x^2-3x+1`
`=x^3-4x^2+x+x^2-4x+1`
`=x(x^2-4x+1)+x^2-4x+1`
`=(x^2-4x+1)(x+1)`
`j)x^4+x^3+x^2+1`
`=x^3(x^2+1)+(x^2+1)`
`=(x^2+1)(x^3+1)`
`k)x^4-4x^3-8x^2+8x`
`=x(x^3-4x^2-8x+8)`
`=x(x^3+2x^2-6x^2-12x+4x+8)`
`=x[(x^2(x+2)-6x(x+2)+4(x+2)]`
`=x(x+2)(x^2-6x+4)`
`l)16x^4(x-y)-x+y`
`=16x^4(x-y)-(x-y)`
`=(x-y)(16x^4-1)`
`=(x-y)[(4x^2)^2-1^2]`
`=(x-y)(4x^2-1)(4x^2+1)`
`m)x^4-x^2+2x+2`
`=x^4-2x^3+2x^2+2x^3-4x^2+4x+x^2-2x+2`
`=x^2(x^2-2x+2)+2x(x^2-2x+2)+x^2-2x+2`
`=(x^2-2x+2)(x^2+2x+1)`
`n)x^2y^2+1-x^2-y^2`
`=x^2y^2-x^2-y^2+1`
`=x^2(y^2-1)-(y^2-1)`
`=(y^2-1)(x^2-1)`
`=(y^2-1^2)-(x^2-1^2)`
`=(y-1)(y+1)-(x-1)(x+1)`
`o)4x^2y^2+1-x^2-y^2`
`=>`Không thể phân tích
`p)5x^4-10x^2y^2+5y^4`
`=5x^4-5x^2y^2-5x^2y^2+5y^4`
`=5x^2(x^2-y^2)-5y^2(x^2-y^2)`
`=(x^2-y^2)(5x^2-5y^2)`
`q)81x^4(z^2-y^2)-z^2+y^2`
`=81x^4(z^2-y^2)-(z^2-y^2)`
`=(z^2-y^2)(81x^4-1)`
`r)(x^2+y^2+xy)^2-x^2y^2-y^2z^2-x^2z^2`
`=-[y^2(z^2-(y+x)^2)+x^2(z^2-(y+x)^2)]`
`=-(y^2+x^2)[z^2-(y+x)^2]`
`=-(y^2+x^2)(z-y-x)(z+y+x)`
`s)x^11+x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+1`
`=x^10(x^2+1)+x^8(x^2+1)+x^6(x^2+1)+x^4(x^2+1)+x^2(x^2+1)+x^2+1`
`=(x^2+1)(x^10+x^8+x^6+x^4+x^2).`
