(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!
答
(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...