计算:(a+2)(a-2)(a^4+4a^2+16) 和 (x^2+2xy+y^2)(x^2-xy+y^2)

问题描述:

计算:(a+2)(a-2)(a^4+4a^2+16) 和 (x^2+2xy+y^2)(x^2-xy+y^2)

(a+2)(a-2)(a^4+4a^2+16)
=(a^2-4)(a^2+4)^2
=(a-2)(a+2)(a^2+4)^2
(x^2+2xy+y^2)(x^2-xy+y^2)
=[(x+y)^2](x+y)(x-y)
=(x-y)(x+y)^3