x的四次方+x²y²+y的四次方
问题描述:
x的四次方+x²y²+y的四次方
答
x^4+x²y²+y^4
=x^4+2x²y²+y^4-x²y²
=(x²+y²)²-x²y²
=(x²+y²-xy)(x²+y²+xy)