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

x^4+x²y²+y^4
=x^4+2x²y²+y^4-x²y²
=(x²+y²)²-x²y²
=(x²+y²-xy)(x²+y²+xy)