4m^2n^2-(m^2+n^2)^2

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4m^2n^2-(m^2+n^2)^24m^2n^2-(m^2+n^2)^24m^2n^2-(m^2+n^2)^2原式=-[(m²+n²)²-4m²n²

4m^2n^2-(m^2+n^2)^2
4m^2n^2-(m^2+n^2)^2

4m^2n^2-(m^2+n^2)^2
原式=-[(m²+n²)²-4m²n²]
=-(m²+n²+2mn)(m²+n²-2mn)
=-(m+n)²(m-n)²