Автор - Liza167

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a^2-x^2+4x-4
-4x^2 +8xy - 4y^2

Ответ

Автор - fyz2612
a^{2} -( x^{2} -4x+4)=a^{2}-(x-2) ^{2} =(a-x+2)(a+x-2) \ -4( x^{2} -2xy+ y^{2} )=-4(x-y) ^{2} =-4(x-y)(x-y)

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