Ответ:
x^2-2xy+y^2-(m^2+2mn+m^2)=x^2-2xy+y^2-m^2-2mn-n^2
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Ответ:
x^2-2xy+y^2-(m^2+2mn+m^2)=x^2-2xy+y^2-m^2-2mn-n^2