1、(x的n次方+y的n次方)（x的n次方-y的n次方）-（x的n次方+y的n次方）²=(x^n+y^n)(x^n-y^n)-(x^n+y^n)^2=(x^n)^2-(y^n)^2-[x^(2n)+2(x^n)*(y^n)+y^(2n)]=x^(2n)-y^(2n)-x^(2n)-y^(2n)-2(x^n)*(y^n)=-2y^(2n)-2(...