Bài 1:
1.$(x-1)^{3}$ =$x^{3}$- 3$x^{2}$+ 3$x^{}$ -1
2.$(1+y)^{3}$ =$1^{}$+ 3$y^{}$+ 3$y^{2}$- $y^{3}$
3.$x^{3}$+ $y^{3}$=$(x^{}$+ $y^{})$ $(x^{2}$- $x^{}$$y^{}$ + $y^{2})$
4.$a^{3}$- $1^{}$=$(a^{}$- $1^{})$ $(a^{2}$+ $a^{}$$^{}$ + $1^{})$
5.$a^{3}$+ $8^{}$=$a^{3}$+ $2^{3}$=$(x^{}$+ $2^{})$ $(x^{2}$- $2x^{}$$^{}$ + $2^{})$
6.$(x^{}$- $1^{})$ $(x^{2}$+ $x^{}$$^{}$ + $1^{})$=$x^{3}$- $1^{}$
