2x²y²-x四次方-y四次方,

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2x²y²-x四次方-y四次方,

2x²y²-x四次方-y四次方,
2x²y²-x四次方-y四次方,

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

2x²y²-x四次方-y四次方
=-(X^4-2x^2y^2+y^4)=-(x^2-y^2)^2

=-(x^2-y^2)^2
=-[(x+y)(x-y)]^2