x的四次方+x²y²+y的四次方

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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)

x的四次方+x²y²+y的四次方
=x^4+2x²y²+y^4-x²y²
=(x²+y²)²-x²y²
=(x²+y²+xy)(x²+y²-xy)