Question

x的六次方减y的六次方等于多少?

Answer 1

x^6-y^6
=(x^2-y^2)(x^4-y^4+x^2y^2)
=(x+y)(x-y)[(x^2+y^2)(x+y)(x-y)+x^2y^2]
=x^2y^2(x+y)^2(x-y)^2