1) (m-n)(m^2+mn+n^2)=m^3+m^2*n+m*n^2-n*m^2-m*n^2-n^3=m^3-n^32) (x+y)(x^2-xy+y^2)=x^3-x^2*y+x*y^2+y*x^2-x*y^2+y^3=x^3+y^33) (p^2-pg+g^2)(p+g)=p^3+p^2*g-p^2*g-p*g^2+g^2*p+g^3=p^3+g^3
1) (m-n)(m^2+mn+n^2)=m^3+m^2*n+m*n^2-n*m^2-m*n^2-n^3=m^3-n^3
2) (x+y)(x^2-xy+y^2)=x^3-x^2*y+x*y^2+y*x^2-x*y^2+y^3=x^3+y^3
3) (p^2-pg+g^2)(p+g)=p^3+p^2*g-p^2*g-p*g^2+g^2*p+g^3=p^3+g^3