(x的四次方+y的四次方-2x²y²)(x的四次方+y的四次方+2x²y²)

问题描述:

(x的四次方+y的四次方-2x²y²)(x的四次方+y的四次方+2x²y²)
快点!

(x的四次方+y的四次方-2x²y²)(x的四次方+y的四次方+2x²y²)=(x²-y²)²(x²+y²)²=[(x²-y²)(x²+y²)]²=(x⁴-y⁴)²=x^8-2...