Bài `1:`

`1, x^3+1=x^3+1^3=(x+1)(x^2-x+1)`

`2,x^3+8=x^3+2^3=(x+2)(x^2-2x+4)`

`3, x^3-8=x^3-2^3=(x-2)(x^2+2x+4)`

`4, x^3-27=x^3-3^3=(x-3)(x^2 +3x+9)`

`5, x^3+y^3=(x+y)(x^2-xy+y^2)`

`6, x^3+8y^3=x^3+(2y)^3=(x+2y)(x^2-2xy+4y^2)`

`7, x^3-y^3=(x-y)(x^2+xy+y^2)`

`8, x^3-8y^3=x^3-(2y)^3=(x-2y)(x^2+2xy+4y^2)`

`9, 1+8x^3=1^3+(2x)^3=(1+2x)(1-2x+4x^2)`

`10,1+27y^3=1^3+(3y)^3=(1+3y)(1-3y+9y^2)`

`11, 1-8x^3=1^3-(2x)^3=(1-2x)(1+2x+4x^2)`

`12, 27x^3-1=(3x)^3-1^3=(3x-1)(9x^2+3x+1)`