(x+y)(x2n - x2n-1 y +x2n-2 y2 -...+x2 y2n-2 - xy2n-1 + y2n)
=x2n+1-x2ny+x2n-1y2-...+x3y2n-2-x2y2n-1+xy2n+x2ny-x2n-1y2+x2n-2y3-...+x2y2n-1-xy2n+y2n+1
=x2n+1+y2n+1+(-x2ny+x2ny)+(x2n-1y2- x2n-1y2)+...+(-xy2n-xy2n)
=x2n+1+y2n+1
vậy x^2n+1 +y^2n+1= (x+y)(x^2n - x^2n-1 y +x^2n-2 y^2 -...+x^2 y^2n-2 - xy^2n-1 + y^2n)