(x-2y)(x²-4y²)(x+2y)=什么?
问题描述:
(x-2y)(x²-4y²)(x+2y)=什么?
不对
答
(x²-4y²)= (x-2y)(x+2y)
(x-2y)(x²-4y²)(x+2y)
=(x-2y)(x-2y)(x+2y)(x+2y)
=(x-2y) ^2(x+2y)^2这个(x²-4y²)= (x-2y)(x+2y)是提示(x-2y)(x²-4y²)(x+2y)=(x-2y)(x-2y)(x+2y)(x+2y)=(x-2y) ^2(x+2y)^2